Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Remoting / Channels / TCP / TcpStreams.cs / 1305376 / TcpStreams.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//============================================================
//
// File: TcpStreams.cs
//
// Summary: Defines streams used by TCP channel.
//
//===========================================================
using System;
using System.Collections;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Globalization;
namespace System.Runtime.Remoting.Channels.Tcp
{
internal abstract class TcpReadingStream : Stream
{
public void ReadToEnd()
{
// This method should never be called where it would be valid
// to use this data, so it is ok to throw the excess bytes
// away.
byte[] buffer = new byte[64];
int readCount;
do
{
readCount = Read(buffer, 0, 64);
} while (readCount > 0);
}
public virtual bool FoundEnd { get { return false; } }
public override bool CanRead { get { return true; } }
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { throw new NotSupportedException(); } }
public override long Position
{
get{ throw new NotSupportedException(); }
set{ throw new NotSupportedException(); }
}
public override void Flush() { throw new NotSupportedException(); }
public override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
public override void SetLength(long value) { throw new NotSupportedException(); }
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
} // TcpReadingStream
internal sealed class TcpFixedLengthReadingStream : TcpReadingStream
{
private SocketHandler _inputStream;
private int _bytesLeft; // bytes left to read
internal TcpFixedLengthReadingStream(SocketHandler inputStream,
int contentLength)
{
_inputStream = inputStream;
_bytesLeft = contentLength;
} // TcpFixedLengthReadingStream
public override bool FoundEnd { get { return _bytesLeft == 0; } }
protected override void Dispose(bool disposing)
{
try {
if (disposing)
_inputStream.OnInputStreamClosed();
}
finally {
base.Dispose(disposing);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (_bytesLeft == 0)
return 0;
int readCount = _inputStream.Read(buffer, offset, Math.Min(_bytesLeft, count));
if (readCount > 0)
_bytesLeft -= readCount;
return readCount;
} // Read
public override int ReadByte()
{
if (_bytesLeft == 0)
return -1;
_bytesLeft -= 1;
return _inputStream.ReadByte();
} // ReadByte
} // TcpFixedLengthReadingStream
internal sealed class TcpChunkedReadingStream : TcpReadingStream
{
private SocketHandler _inputStream = null; // read chunked tcp data from here
private int _bytesLeft; // bytes left in current chunk
private bool _bFoundEnd = false; // has end of stream been reached?
private byte[] _byteBuffer = new byte[1]; // buffer for reading bytes
internal TcpChunkedReadingStream(SocketHandler inputStream)
{
_inputStream = inputStream;
_bytesLeft = 0;
} // HttpChunkedRequestStream
public override bool FoundEnd { get { return _bFoundEnd; } }
protected override void Dispose(bool disposing)
{
try {
//
}
finally {
base.Dispose(disposing);
}
} // Close
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
while (!_bFoundEnd && (count > 0))
{
// see if we need to start reading a new chunk
if (_bytesLeft == 0)
{
_bytesLeft = _inputStream.ReadInt32();
if (_bytesLeft == 0)
{
ReadTrailer();
_bFoundEnd = true;
}
}
if (!_bFoundEnd)
{
int readCount = Math.Min(_bytesLeft, count);
int bytesReadThisTime = _inputStream.Read(buffer, offset, readCount);
if (bytesReadThisTime <= 0)
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
_bytesLeft -= bytesReadThisTime;
count -= bytesReadThisTime;
offset += bytesReadThisTime;
bytesRead += bytesReadThisTime;
// see if the end of the chunk was found
if (_bytesLeft == 0)
{
ReadTrailer();
}
}
} // while (count > 0)
return bytesRead;
} // Read
public override int ReadByte()
{
int readCount = Read(_byteBuffer, 0, 1);
if (readCount == 0)
return -1;
return _byteBuffer[0];
} // ReadByte
private void ReadTrailer()
{
// read trailer bytes "\r\n" and throw an exception if they aren't correct.
int ch = _inputStream.ReadByte();
if (ch != '\r')
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
ch = _inputStream.ReadByte();
if (ch != '\n')
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
}
} // TcpChunkedReadingStream
// Maintains control of a socket connection.
internal sealed class TcpServerSocketHandler : TcpSocketHandler
{
// prebaked bytes
private static byte[] s_endOfLineBytes = Encoding.ASCII.GetBytes("\r\n");
// Used to keep track of socket connections
private static Int64 _connectionIdCounter = 0;
private Int64 _connectionId; // id for this connection
private bool _bOneWayRequest; // is the incoming request one way?
private bool _bChunked; // is the incoming request chunked?
private int _contentLength; // content length of incoming request
TcpReadingStream _requestStream; // the request stream
internal TcpServerSocketHandler(Socket socket, RequestQueue requestQueue, Stream stream) :
base(socket, requestQueue, stream)
{
_connectionId = Interlocked.Increment(ref _connectionIdCounter);
} // TcpServerSocketHandler
// Determine if it's possible to service another request
public bool CanServiceAnotherRequest()
{
return true;
} // CanServiceAnotherRequest
// Prepare for reading a new request off of the same socket
protected override void PrepareForNewMessage()
{
if (_requestStream != null)
{
if (!_requestStream.FoundEnd)
_requestStream.ReadToEnd();
_requestStream = null;
}
} // PrepareForNewRequest
protected override void SendErrorMessageIfPossible(Exception e)
{
// A fatal exception occurred. We communicate this error by
// writing an error message and empty message body.
try
{
SendErrorResponse(e, true);
}
catch
{
// the connection must be dead, so it doesn't really matter.
}
} // SendErrorMessageIfPossible
// read headers
public ITransportHeaders ReadHeaders()
{
BaseTransportHeaders headers = new BaseTransportHeaders();
UInt16 operation;
ReadVersionAndOperation(out operation);
// make sure the operation is Request or OneWayRequest.
if (operation == TcpOperations.Request)
{
_bOneWayRequest = false;
}
else
if (operation == TcpOperations.OneWayRequest)
{
_bOneWayRequest = true;
}
else
{
throw new RemotingException(
String.Format(
CultureInfo.CurrentCulture, CoreChannel.GetResourceString("Remoting_Tcp_ExpectingRequestOp"),
operation.ToString(CultureInfo.CurrentCulture)));
}
// content length must come next (may be chunked or a specific length)
ReadContentLength(out _bChunked, out _contentLength);
// read to end of headers
ReadToEndOfHeaders(headers);
// add IP address and Connection Id to headers
headers.IPAddress = ((IPEndPoint)NetSocket.RemoteEndPoint).Address;
headers.ConnectionId = _connectionId;
return headers;
} // ReadHeaders
public Stream GetRequestStream()
{
if (!_bChunked)
_requestStream = new TcpFixedLengthReadingStream(this, _contentLength);
else
_requestStream = new TcpChunkedReadingStream(this);
return _requestStream;
} // GetRequestStream
public void SendResponse(ITransportHeaders headers, Stream contentStream)
{
// bail out if the original request was OneWay (means the client doesn't even
// want or expect to receive responses or error messages)
if (_bOneWayRequest)
return;
// build up headers and send
ChunkedMemoryStream headerStream = new ChunkedMemoryStream(CoreChannel.BufferPool);
// output preamble and version
WritePreambleAndVersion(headerStream);
// output opcode
WriteUInt16(TcpOperations.Reply, headerStream);
// output content length delimiter
WriteUInt16(TcpContentDelimiter.ContentLength, headerStream);
WriteInt32((int)contentStream.Length, headerStream);
// No status code header is needed because if we're in this code path
// the data transfer succeeded as far as the transport protocol is
// concerned (and the success status code is optional).
WriteHeaders(headers, headerStream);
headerStream.WriteTo(NetStream);
headerStream.Close();
StreamHelper.CopyStream(contentStream, NetStream);
contentStream.Close();
} // SendResponse
string GenerateFaultString(Exception e) {
//If the user has specified it's a development server (versus a production server) in remoting config,
//then we should just return e.ToString instead of extracting the list of messages.
if (!CustomErrorsEnabled())
return e.ToString();
else {
return CoreChannel.GetResourceString("Remoting_InternalError");
}
}
public void SendErrorResponse(Exception e, bool bCloseConnection)
{
SendErrorResponse(GenerateFaultString(e), bCloseConnection);
}
public void SendErrorResponse(string e, bool bCloseConnection)
{
// bail out if the original request was OneWay (means the client doesn't even
// want or expect to receive responses or error messages)
if (_bOneWayRequest)
return;
// build up headers and send
ChunkedMemoryStream headerStream = new ChunkedMemoryStream(CoreChannel.BufferPool);
// output preamble and version
WritePreambleAndVersion(headerStream);
// output opcode
WriteUInt16(TcpOperations.Reply, headerStream);
// output content length delimiter (0-length stream)
WriteUInt16(TcpContentDelimiter.ContentLength, headerStream);
WriteInt32(0, headerStream);
// output status code and reason
WriteUInt16(TcpHeaders.StatusCode, headerStream);
WriteByte(TcpHeaderFormat.UInt16, headerStream);
WriteUInt16(TcpStatusCode.GenericError, headerStream);
// we purposely don't include the stack trace to avoid giving
// out too much information for security purposes.
WriteUInt16(TcpHeaders.StatusPhrase, headerStream);
WriteByte(TcpHeaderFormat.CountedString, headerStream);
WriteCountedString(e, headerStream);
// indicate that we are about to close the connection
WriteUInt16(TcpHeaders.CloseConnection, headerStream);
WriteByte(TcpHeaderFormat.Void, headerStream);
// end of headers
WriteUInt16(TcpHeaders.EndOfHeaders, headerStream);
headerStream.WriteTo(NetStream);
headerStream.Close();
} // SendErrorResponse
} // class TcpServerSocketHandler
} // namespace System.Runtime.Remoting.Channels.Tcp
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//============================================================
//
// File: TcpStreams.cs
//
// Summary: Defines streams used by TCP channel.
//
//===========================================================
using System;
using System.Collections;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Globalization;
namespace System.Runtime.Remoting.Channels.Tcp
{
internal abstract class TcpReadingStream : Stream
{
public void ReadToEnd()
{
// This method should never be called where it would be valid
// to use this data, so it is ok to throw the excess bytes
// away.
byte[] buffer = new byte[64];
int readCount;
do
{
readCount = Read(buffer, 0, 64);
} while (readCount > 0);
}
public virtual bool FoundEnd { get { return false; } }
public override bool CanRead { get { return true; } }
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { throw new NotSupportedException(); } }
public override long Position
{
get{ throw new NotSupportedException(); }
set{ throw new NotSupportedException(); }
}
public override void Flush() { throw new NotSupportedException(); }
public override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
public override void SetLength(long value) { throw new NotSupportedException(); }
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
} // TcpReadingStream
internal sealed class TcpFixedLengthReadingStream : TcpReadingStream
{
private SocketHandler _inputStream;
private int _bytesLeft; // bytes left to read
internal TcpFixedLengthReadingStream(SocketHandler inputStream,
int contentLength)
{
_inputStream = inputStream;
_bytesLeft = contentLength;
} // TcpFixedLengthReadingStream
public override bool FoundEnd { get { return _bytesLeft == 0; } }
protected override void Dispose(bool disposing)
{
try {
if (disposing)
_inputStream.OnInputStreamClosed();
}
finally {
base.Dispose(disposing);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (_bytesLeft == 0)
return 0;
int readCount = _inputStream.Read(buffer, offset, Math.Min(_bytesLeft, count));
if (readCount > 0)
_bytesLeft -= readCount;
return readCount;
} // Read
public override int ReadByte()
{
if (_bytesLeft == 0)
return -1;
_bytesLeft -= 1;
return _inputStream.ReadByte();
} // ReadByte
} // TcpFixedLengthReadingStream
internal sealed class TcpChunkedReadingStream : TcpReadingStream
{
private SocketHandler _inputStream = null; // read chunked tcp data from here
private int _bytesLeft; // bytes left in current chunk
private bool _bFoundEnd = false; // has end of stream been reached?
private byte[] _byteBuffer = new byte[1]; // buffer for reading bytes
internal TcpChunkedReadingStream(SocketHandler inputStream)
{
_inputStream = inputStream;
_bytesLeft = 0;
} // HttpChunkedRequestStream
public override bool FoundEnd { get { return _bFoundEnd; } }
protected override void Dispose(bool disposing)
{
try {
//
}
finally {
base.Dispose(disposing);
}
} // Close
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
while (!_bFoundEnd && (count > 0))
{
// see if we need to start reading a new chunk
if (_bytesLeft == 0)
{
_bytesLeft = _inputStream.ReadInt32();
if (_bytesLeft == 0)
{
ReadTrailer();
_bFoundEnd = true;
}
}
if (!_bFoundEnd)
{
int readCount = Math.Min(_bytesLeft, count);
int bytesReadThisTime = _inputStream.Read(buffer, offset, readCount);
if (bytesReadThisTime <= 0)
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
_bytesLeft -= bytesReadThisTime;
count -= bytesReadThisTime;
offset += bytesReadThisTime;
bytesRead += bytesReadThisTime;
// see if the end of the chunk was found
if (_bytesLeft == 0)
{
ReadTrailer();
}
}
} // while (count > 0)
return bytesRead;
} // Read
public override int ReadByte()
{
int readCount = Read(_byteBuffer, 0, 1);
if (readCount == 0)
return -1;
return _byteBuffer[0];
} // ReadByte
private void ReadTrailer()
{
// read trailer bytes "\r\n" and throw an exception if they aren't correct.
int ch = _inputStream.ReadByte();
if (ch != '\r')
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
ch = _inputStream.ReadByte();
if (ch != '\n')
{
throw new RemotingException(
CoreChannel.GetResourceString(
"Remoting_Tcp_ChunkedEncodingError"));
}
}
} // TcpChunkedReadingStream
// Maintains control of a socket connection.
internal sealed class TcpServerSocketHandler : TcpSocketHandler
{
// prebaked bytes
private static byte[] s_endOfLineBytes = Encoding.ASCII.GetBytes("\r\n");
// Used to keep track of socket connections
private static Int64 _connectionIdCounter = 0;
private Int64 _connectionId; // id for this connection
private bool _bOneWayRequest; // is the incoming request one way?
private bool _bChunked; // is the incoming request chunked?
private int _contentLength; // content length of incoming request
TcpReadingStream _requestStream; // the request stream
internal TcpServerSocketHandler(Socket socket, RequestQueue requestQueue, Stream stream) :
base(socket, requestQueue, stream)
{
_connectionId = Interlocked.Increment(ref _connectionIdCounter);
} // TcpServerSocketHandler
// Determine if it's possible to service another request
public bool CanServiceAnotherRequest()
{
return true;
} // CanServiceAnotherRequest
// Prepare for reading a new request off of the same socket
protected override void PrepareForNewMessage()
{
if (_requestStream != null)
{
if (!_requestStream.FoundEnd)
_requestStream.ReadToEnd();
_requestStream = null;
}
} // PrepareForNewRequest
protected override void SendErrorMessageIfPossible(Exception e)
{
// A fatal exception occurred. We communicate this error by
// writing an error message and empty message body.
try
{
SendErrorResponse(e, true);
}
catch
{
// the connection must be dead, so it doesn't really matter.
}
} // SendErrorMessageIfPossible
// read headers
public ITransportHeaders ReadHeaders()
{
BaseTransportHeaders headers = new BaseTransportHeaders();
UInt16 operation;
ReadVersionAndOperation(out operation);
// make sure the operation is Request or OneWayRequest.
if (operation == TcpOperations.Request)
{
_bOneWayRequest = false;
}
else
if (operation == TcpOperations.OneWayRequest)
{
_bOneWayRequest = true;
}
else
{
throw new RemotingException(
String.Format(
CultureInfo.CurrentCulture, CoreChannel.GetResourceString("Remoting_Tcp_ExpectingRequestOp"),
operation.ToString(CultureInfo.CurrentCulture)));
}
// content length must come next (may be chunked or a specific length)
ReadContentLength(out _bChunked, out _contentLength);
// read to end of headers
ReadToEndOfHeaders(headers);
// add IP address and Connection Id to headers
headers.IPAddress = ((IPEndPoint)NetSocket.RemoteEndPoint).Address;
headers.ConnectionId = _connectionId;
return headers;
} // ReadHeaders
public Stream GetRequestStream()
{
if (!_bChunked)
_requestStream = new TcpFixedLengthReadingStream(this, _contentLength);
else
_requestStream = new TcpChunkedReadingStream(this);
return _requestStream;
} // GetRequestStream
public void SendResponse(ITransportHeaders headers, Stream contentStream)
{
// bail out if the original request was OneWay (means the client doesn't even
// want or expect to receive responses or error messages)
if (_bOneWayRequest)
return;
// build up headers and send
ChunkedMemoryStream headerStream = new ChunkedMemoryStream(CoreChannel.BufferPool);
// output preamble and version
WritePreambleAndVersion(headerStream);
// output opcode
WriteUInt16(TcpOperations.Reply, headerStream);
// output content length delimiter
WriteUInt16(TcpContentDelimiter.ContentLength, headerStream);
WriteInt32((int)contentStream.Length, headerStream);
// No status code header is needed because if we're in this code path
// the data transfer succeeded as far as the transport protocol is
// concerned (and the success status code is optional).
WriteHeaders(headers, headerStream);
headerStream.WriteTo(NetStream);
headerStream.Close();
StreamHelper.CopyStream(contentStream, NetStream);
contentStream.Close();
} // SendResponse
string GenerateFaultString(Exception e) {
//If the user has specified it's a development server (versus a production server) in remoting config,
//then we should just return e.ToString instead of extracting the list of messages.
if (!CustomErrorsEnabled())
return e.ToString();
else {
return CoreChannel.GetResourceString("Remoting_InternalError");
}
}
public void SendErrorResponse(Exception e, bool bCloseConnection)
{
SendErrorResponse(GenerateFaultString(e), bCloseConnection);
}
public void SendErrorResponse(string e, bool bCloseConnection)
{
// bail out if the original request was OneWay (means the client doesn't even
// want or expect to receive responses or error messages)
if (_bOneWayRequest)
return;
// build up headers and send
ChunkedMemoryStream headerStream = new ChunkedMemoryStream(CoreChannel.BufferPool);
// output preamble and version
WritePreambleAndVersion(headerStream);
// output opcode
WriteUInt16(TcpOperations.Reply, headerStream);
// output content length delimiter (0-length stream)
WriteUInt16(TcpContentDelimiter.ContentLength, headerStream);
WriteInt32(0, headerStream);
// output status code and reason
WriteUInt16(TcpHeaders.StatusCode, headerStream);
WriteByte(TcpHeaderFormat.UInt16, headerStream);
WriteUInt16(TcpStatusCode.GenericError, headerStream);
// we purposely don't include the stack trace to avoid giving
// out too much information for security purposes.
WriteUInt16(TcpHeaders.StatusPhrase, headerStream);
WriteByte(TcpHeaderFormat.CountedString, headerStream);
WriteCountedString(e, headerStream);
// indicate that we are about to close the connection
WriteUInt16(TcpHeaders.CloseConnection, headerStream);
WriteByte(TcpHeaderFormat.Void, headerStream);
// end of headers
WriteUInt16(TcpHeaders.EndOfHeaders, headerStream);
headerStream.WriteTo(NetStream);
headerStream.Close();
} // SendErrorResponse
} // class TcpServerSocketHandler
} // namespace System.Runtime.Remoting.Channels.Tcp
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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