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HandshakeMessagesBuffer.cs
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#if NET45 || NET451 || DNX451
#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TlsClientStream
{
internal class HandshakeMessagesBuffer : IDisposable
{
readonly List<byte[]> _messages = new List<byte[]>();
byte[] _headerBuffer;
int _headerBufferLen;
byte[] _buffer;
int _bufferLen;
public List<byte[]> Messages => _messages;
public bool HasServerHelloDone { get; private set; }
public bool HasBufferedData => _headerBuffer != null;
bool _hasFinished;
bool _hasHelloRequest;
void CheckType(HandshakeType type)
{
if (type == HandshakeType.ServerHelloDone)
HasServerHelloDone = true;
else if (type == HandshakeType.Finished)
_hasFinished = true;
else if (type == HandshakeType.HelloRequest)
_hasHelloRequest = true;
}
public static bool IsHelloRequest(byte[] message)
{
return message[0] == (byte)HandshakeType.HelloRequest && message[1] == 0 && message[2] == 0 && message[3] == 0;
}
public int AddBytes(byte[] buffer, int offset, int length, IgnoreHelloRequestsSettings ignoreHelloRequests = IgnoreHelloRequestsSettings.IncludeHelloRequests)
{
var numAdded = 0;
var end = offset + length;
while (true)
{
if (_headerBufferLen == 0)
{
while (offset + 4 <= end)
{
// We can read at least the header
int start = offset;
offset++;
var messageLen = Utils.ReadUInt24(buffer, ref offset);
offset += messageLen;
if (offset <= end)
{
// Whole message fits in buffer, this is the common case
var message = new byte[4 + messageLen];
Buffer.BlockCopy(buffer, start, message, 0, 4 + messageLen);
if ((!_hasHelloRequest && (ignoreHelloRequests == IgnoreHelloRequestsSettings.IncludeHelloRequests ||
(ignoreHelloRequests == IgnoreHelloRequestsSettings.IgnoreHelloRequestsUntilFinished && _hasFinished))) ||
!IsHelloRequest(message))
{
_messages.Add(message);
CheckType((HandshakeType)message[0]);
numAdded++;
}
}
else
{
// The header fits in the buffer, but not the entire message
_headerBuffer = new byte[4];
_headerBufferLen = 4;
Buffer.BlockCopy(buffer, start, _headerBuffer, 0, 4);
_buffer = new byte[messageLen];
_bufferLen = messageLen - (offset - end);
Buffer.BlockCopy(buffer, start + 4, _buffer, 0, _bufferLen);
}
}
if (offset < end)
{
// Else, the whole header does not fit in the buffer
_headerBuffer = new byte[4];
_headerBufferLen = end - offset;
Buffer.BlockCopy(buffer, offset, _headerBuffer, 0, _headerBufferLen);
}
return numAdded;
}
else
{
// We have previously buffered up a part of a message that needs to be completed
if (_headerBufferLen < 4)
{
var toCopy = Math.Min(end - offset, 4 - _headerBufferLen);
Buffer.BlockCopy(buffer, offset, _headerBuffer, _headerBufferLen, toCopy);
_headerBufferLen += toCopy;
offset += toCopy;
if (_headerBufferLen < 4)
return numAdded;
}
// Now header buffer is complete, so we can fetch message len and fill rest of message buffer as much as possible
var tmpOffset = 1;
var messageLen = Utils.ReadUInt24(_headerBuffer, ref tmpOffset);
var bytesToCopy = Math.Min(end - offset, messageLen - _bufferLen);
if (_buffer == null)
_buffer = new byte[messageLen];
Buffer.BlockCopy(buffer, offset, _buffer, _bufferLen, bytesToCopy);
offset += bytesToCopy;
_bufferLen += bytesToCopy;
if (_bufferLen != messageLen)
{
return numAdded;
}
// Now we have a complete message to insert to the queue
var message = new byte[4 + messageLen];
Buffer.BlockCopy(_headerBuffer, 0, message, 0, 4);
Buffer.BlockCopy(_buffer, 0, message, 4, messageLen);
if ((!_hasHelloRequest && (ignoreHelloRequests == IgnoreHelloRequestsSettings.IncludeHelloRequests ||
(ignoreHelloRequests == IgnoreHelloRequestsSettings.IgnoreHelloRequestsUntilFinished && _hasFinished))) ||
!IsHelloRequest(message))
{
_messages.Add(message);
CheckType((HandshakeType)message[0]);
numAdded++;
}
_headerBuffer = null;
_headerBufferLen = 0;
Utils.ClearArray(_buffer);
_buffer = null;
_bufferLen = 0;
}
}
}
public void RemoveFirst()
{
if ((HandshakeType)_messages[0][0] == HandshakeType.Finished)
_hasFinished = false;
// Ignore HasServerHelloDone and _hasHelloRequest
Utils.ClearArray(_messages[0]);
_messages.RemoveAt(0);
}
/*public void RemoveRange(int index, int count)
{
for (var i = 0; i < count; i++)
Utils.ClearArray(_messages[index + i]);
_messages.RemoveRange(index, count);
}*/
public void ClearMessages()
{
foreach (var arr in _messages)
{
Utils.ClearArray(arr);
}
_messages.Clear();
HasServerHelloDone = false;
_hasFinished = false;
_hasHelloRequest = false;
}
public void Dispose()
{
ClearMessages();
}
public enum IgnoreHelloRequestsSettings
{
IncludeHelloRequests,
IgnoreHelloRequests,
IgnoreHelloRequestsUntilFinished
}
}
}
#endif