protected void Push(NetContext context, WebSocketsFrame frame)
{
lock (this)
{
int maxQuota = context.Handler.MaxIncomingQuota;
if (maxQuota > 0 && ProtocolProcessor.Sum(holder, f =>
{
var typed = f as WebSocketsFrame;
return(typed == null ? 0 : typed.GetLengthEstimate());
}) + frame.GetLengthEstimate() > maxQuota)
{
throw new InvalidOperationException("Inbound quota exceeded");
}
ProtocolProcessor.AddFrame(context, ref holder, frame);
}
}
public static WebSocketsFrame TryParseFrameHeader(byte[] buffer, int bytesAvailable, out int headerLength)
{
int maskOffset;
if (bytesAvailable < 2)
{
headerLength = 0;
return null;
}
bool masked = (buffer[1] & 128) != 0;
int tmp = buffer[1] & 127;
int payloadLen;
switch (tmp)
{
case 126:
headerLength = masked ? 8 : 4;
if (bytesAvailable < headerLength) return null;
payloadLen = (buffer[2] << 8) | buffer[3];
maskOffset = 4;
break;
case 127:
headerLength = masked ? 14 : 10;
if (bytesAvailable < headerLength) return null;
int big = WebSocketsProcessor.ReadInt32(buffer, 2), little = WebSocketsProcessor.ReadInt32(buffer, 6);
if (big != 0 || little < 0) throw new ArgumentOutOfRangeException(); // seriously, we're not going > 2GB
payloadLen = little;
maskOffset = 10;
break;
default:
headerLength = masked ? 6 : 2;
if (bytesAvailable < headerLength) return null;
payloadLen = tmp;
maskOffset = 2;
break;
}
var frame = new WebSocketsFrame();
frame.IsFinal = (buffer[0] & 128) != 0;
frame.Reserved1 = (buffer[0] & 64) != 0;
frame.Reserved2 = (buffer[0] & 32) != 0;
frame.Reserved3 = (buffer[0] & 16) != 0;
frame.OpCode = (WebSocketsFrame.OpCodes)(buffer[0] & 15);
frame.Mask = masked ? (int?)WebSocketsProcessor.ReadInt32(buffer, maskOffset) : null;
frame.PayloadLength = payloadLen;
return frame;
}
protected override void GracefulShutdown(NetContext context, Connection connection)
{
connection.DisableRead();
var ws = (WebSocketConnection)connection;
if (!ws.HasSentClose)
{
ws.HasSentClose = true;
var close = new WebSocketsFrame();
if (IsClient)
{
close.Mask = CreateMask();
}
close.OpCode = WebSocketsFrame.OpCodes.Close;
close.PayloadLength = 0;
SendControl(context, close);
}
SendShutdown(context);
connection.PromptToSend(context);
}
private void ProcessFrame(NetContext context, Connection connection, WebSocketsFrame frame)
{
if(IsClient)
{
if(frame.Mask.HasValue) throw new InvalidOperationException("Clients only expect unmasked frames");
} else
{
if (!frame.Mask.HasValue) throw new InvalidOperationException("Servers only expect masked frames");
}
var ws = (WebSocketConnection) connection;
if(frame.IsControlFrame)
{
if(!frame.IsFinal) throw new InvalidOperationException("control frames cannot be fragmented");
switch(frame.OpCode)
{
case WebSocketsFrame.OpCodes.Close:
// respond with a closing handshake
GracefulShutdown(context, connection);
break;
case WebSocketsFrame.OpCodes.Pong:
// could add some reaction here
break;
case WebSocketsFrame.OpCodes.Ping:
// send a "pong" with the same payload
var pong = new WebSocketsFrame();
if (IsClient) pong.Mask = CreateMask();
pong.OpCode = WebSocketsFrame.OpCodes.Binary;
pong.PayloadLength = frame.PayloadLength;
if(frame.Payload != null)
{
var ms = new MemoryStream((int)frame.Payload.Length);
byte[] buffer = null;
try
{
buffer = context.GetBuffer();
Copy(frame.Payload, ms, buffer, null, frame.PayloadLength);
} finally
{
context.Recycle(buffer);
}
pong.Payload = ms;
}
SendControl(context, pong);
connection.PromptToSend(context);
break;
default:
throw new InvalidOperationException();
}
}
else
{
if (!ws.AllowIncomingDataFrames) throw new InvalidOperationException("Data frames disabled");
int pendingCount = FrameCount;
if (frame.OpCode == WebSocketsFrame.OpCodes.Continuation)
{
if(pendingCount == 0) throw new InvalidOperationException("Continuation of nothing");
}
else if (pendingCount != 0)
{
throw new InvalidOperationException("Should be a continuation");
}
if (!frame.IsFinal)
{
Push(context, frame);
}
else
{
if(pendingCount == 0)
{
Process(context, connection, frame.Payload, frame.OpCode);
} else
{
throw new NotImplementedException();
}
}
}
if (frame.OpCode == WebSocketsFrame.OpCodes.Close)
{
Debug.WriteLine("Sent close frame: " + connection);
}
}
protected override void GracefulShutdown(NetContext context, Connection connection)
{
connection.DisableRead();
var ws = (WebSocketConnection) connection;
if(!ws.HasSentClose)
{
ws.HasSentClose = true;
var close = new WebSocketsFrame();
if (IsClient) close.Mask = CreateMask();
close.OpCode = WebSocketsFrame.OpCodes.Close;
close.PayloadLength = 0;
SendControl(context, close);
}
SendShutdown(context);
connection.PromptToSend(context);
}
static string ReadFrameMessage(WebSocketsFrame frame)
{
var ms = new MemoryStream();
frame.Payload.CopyTo(ms);
return Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Length);
}
static string DecompressFrame(IExtension extn, params byte[] data)
{
var handler = new TcpHandler();
var ctx = new NetContext(delegate { }, handler);
if (extn == null) extn = PerFrameDeflate.Default.CreateExtension("deflate-frame");
var frame = new WebSocketsFrame {
OpCode = WebSocketsFrame.OpCodes.Text,
Payload = new MemoryStream(data),
PayloadLength = data.Length,
Reserved1 = true
};
var connection = new WebSocketConnection(new IPEndPoint(IPAddress.Loopback, 20000));
var decoded = extn.ApplyIncoming(ctx, connection, frame).Single();
return ReadFrameMessage(decoded);
}
IEnumerable <WebSocketsFrame> IExtension.ApplyOutgoing(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (!frame.IsControlFrame && frame.PayloadLength > parent.compressMessagesLargerThanBytes)
{
if (frame.Reserved1)
{
throw new InvalidOperationException("Reserved1 flag is already set; extension conflict?");
}
int headerBytes = 0;
if (outbound == null)
{
outbound = new ZStream();
const int BITS = 12; // 4096 byte outbound buffer (instead of full 32k=15)
outbound.deflateInit(zlibConst.Z_BEST_COMPRESSION, BITS);
headerBytes = 2;
}
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
inBuffer = context.GetBuffer();
outBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
outbound.next_out = outBuffer;
outbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0)
{
break;
}
remaining -= readCount;
outbound.next_in_index = 0;
outbound.avail_in = readCount;
do
{
outbound.next_out_index = 0;
outbound.avail_out = outBuffer.Length;
long priorOut = outbound.total_out;
int err = outbound.deflate(remaining == 0 ? zlibConst.Z_SYNC_FLUSH : zlibConst.Z_NO_FLUSH);
if (err != zlibConst.Z_OK && err != zlibConst.Z_STREAM_END)
{
throw new ZStreamException("deflating: " + outbound.msg);
}
int outCount = (int)(outbound.total_out - priorOut);
if (outCount > 0)
{
if (headerBytes == 0)
{
tmp.Write(outBuffer, 0, outCount);
}
else
{
if (outCount < headerBytes)
{
throw new InvalidOperationException("Failed to write entire header");
}
// check the generated header meets our expectations
// CMF is very specific - CM must be 8, and CINFO must be <=7 (for 32k window)
if ((outBuffer[0] & 15) != 8)
{
throw new InvalidOperationException("Zlib CM header was incorrect");
}
if ((outBuffer[0] & 128) != 0) // if msb set, is > 7 - invalid
{
throw new InvalidOperationException("Zlib CINFO header was incorrect");
}
// FLG is less important; FCHECK is irrelevent, FLEVEL doesn't matter; but
// FDICT must be zero, to ensure that we aren't expecting a an initialization dictionary
if ((outBuffer[1] & 32) != 0)
{
throw new InvalidOperationException("Zlib FLG.FDICT header was set (must not be)");
}
// skip the header, and write anything else
outCount -= headerBytes;
if (outCount > 0)
{
tmp.Write(outBuffer, headerBytes, outCount);
}
headerBytes = 0; // all written now
}
}
} while (outbound.avail_in > 0 || outbound.avail_out == 0);
}
if (remaining != 0)
{
throw new EndOfStreamException();
}
if (headerBytes != 0)
{
throw new InvalidOperationException("Zlib header was not written");
}
// verify the last 4 bytes, then drop them
tmp.Position = tmp.Length - 4;
NetContext.Fill(tmp, outBuffer, 4);
if (!(outBuffer[0] == 0x00 && outBuffer[1] == 0x00 && outBuffer[2] == 0xFF && outBuffer[3] == 0xFF))
{
throw new InvalidOperationException("expectation failed: 0000FFFF in the tail");
}
if (parent.disableContextTakeover && tmp.Length >= frame.PayloadLength)
{ // compressing it didn't do anything useful; since we're going to discard
// the compression context, we might as well stick with the original data
payload.Position = 0;
payload = null; // so that it doesn't get disposed
}
else
{
// set our final output
tmp.Position = 0;
tmp.SetLength(tmp.Length - 4);
long bytesSaved = frame.PayloadLength - tmp.Length;
frame.Payload = tmp;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = true;
tmp = payload as BufferStream;
parent.RegisterOutboundBytesSaved(bytesSaved);
}
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (outbound != null)
{
outbound.next_out = null;
outbound.next_in = null;
}
if (tmp != null)
{
tmp.Dispose();
}
if (inBuffer != null)
{
context.Recycle(inBuffer);
}
if (outBuffer != null)
{
context.Recycle(outBuffer);
}
if (parent.disableContextTakeover)
{
ClearContext(false, true);
}
}
}
yield return(frame);
}
IEnumerable<WebSocketsFrame> IExtension.ApplyOutgoing(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (!frame.IsControlFrame && frame.PayloadLength > parent.compressMessagesLargerThanBytes)
{
if (frame.Reserved1)
{
throw new InvalidOperationException("Reserved1 flag is already set; extension conflict?");
}
int headerBytes = 0;
if (outbound == null)
{
outbound = new ZStream();
const int BITS = 12; // 4096 byte outbound buffer (instead of full 32k=15)
outbound.deflateInit(zlibConst.Z_BEST_COMPRESSION, BITS);
headerBytes = 2;
}
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
inBuffer = context.GetBuffer();
outBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
outbound.next_out = outBuffer;
outbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0) break;
remaining -= readCount;
outbound.next_in_index = 0;
outbound.avail_in = readCount;
do
{
outbound.next_out_index = 0;
outbound.avail_out = outBuffer.Length;
long priorOut = outbound.total_out;
int err = outbound.deflate(remaining == 0 ? zlibConst.Z_SYNC_FLUSH : zlibConst.Z_NO_FLUSH);
if (err != zlibConst.Z_OK && err != zlibConst.Z_STREAM_END)
throw new ZStreamException("deflating: " + outbound.msg);
int outCount = (int)(outbound.total_out - priorOut);
if (outCount > 0)
{
if (headerBytes == 0)
{
tmp.Write(outBuffer, 0, outCount);
}
else
{
if (outCount < headerBytes)
{
throw new InvalidOperationException("Failed to write entire header");
}
// check the generated header meets our expectations
// CMF is very specific - CM must be 8, and CINFO must be <=7 (for 32k window)
if ((outBuffer[0] & 15) != 8)
{
throw new InvalidOperationException("Zlib CM header was incorrect");
}
if ((outBuffer[0] & 128) != 0) // if msb set, is > 7 - invalid
{
throw new InvalidOperationException("Zlib CINFO header was incorrect");
}
// FLG is less important; FCHECK is irrelevent, FLEVEL doesn't matter; but
// FDICT must be zero, to ensure that we aren't expecting a an initialization dictionary
if ((outBuffer[1] & 32) != 0)
{
throw new InvalidOperationException("Zlib FLG.FDICT header was set (must not be)");
}
// skip the header, and write anything else
outCount -= headerBytes;
if (outCount > 0)
{
tmp.Write(outBuffer, headerBytes, outCount);
}
headerBytes = 0; // all written now
}
}
} while (outbound.avail_in > 0 || outbound.avail_out == 0);
}
if (remaining != 0) throw new EndOfStreamException();
if (headerBytes != 0) throw new InvalidOperationException("Zlib header was not written");
// verify the last 4 bytes, then drop them
tmp.Position = tmp.Length - 4;
NetContext.Fill(tmp, outBuffer, 4);
if (!(outBuffer[0] == 0x00 && outBuffer[1] == 0x00 && outBuffer[2] == 0xFF && outBuffer[3] == 0xFF))
{
throw new InvalidOperationException("expectation failed: 0000FFFF in the tail");
}
if (parent.disableContextTakeover && tmp.Length >= frame.PayloadLength)
{ // compressing it didn't do anything useful; since we're going to discard
// the compression context, we might as well stick with the original data
payload.Position = 0;
payload = null; // so that it doesn't get disposed
}
else
{
// set our final output
tmp.Position = 0;
tmp.SetLength(tmp.Length - 4);
long bytesSaved = frame.PayloadLength - tmp.Length;
frame.Payload = tmp;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = true;
tmp = payload as BufferStream;
parent.RegisterOutboundBytesSaved(bytesSaved);
}
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (outbound != null)
{
outbound.next_out = null;
outbound.next_in = null;
}
if (tmp != null) tmp.Dispose();
if (inBuffer != null) context.Recycle(inBuffer);
if (outBuffer != null) context.Recycle(outBuffer);
if (parent.disableContextTakeover) ClearContext(false, true);
}
}
yield return frame;
}
private static IEnumerable<WebSocketsFrame> ApplyExtensions(NetContext context, Connection connection, WebSocketsFrame frame, bool inbound)
{
var wsc = connection as WebSocketConnection;
var extn = wsc == null ? null : wsc.Extensions;
IEnumerable<WebSocketsFrame> frames = Enumerable.Repeat(frame, 1);
if (extn != null && extn.Length != 0)
{
for (int i = 0; i < extn.Length; i++)
{
var actualExtension = extn[i];
if (inbound)
{
frames = frames.SelectMany(x => actualExtension.ApplyIncoming(context, wsc, x));
}
else
{
frames = frames.SelectMany(x => actualExtension.ApplyOutgoing(context, wsc, x));
}
}
}
return frames;
}
private static IEnumerable <WebSocketsFrame> ApplyExtensions(NetContext context, Connection connection, WebSocketsFrame frame, bool inbound)
{
var wsc = connection as WebSocketConnection;
var extn = wsc == null ? null : wsc.Extensions;
IEnumerable <WebSocketsFrame> frames = Enumerable.Repeat(frame, 1);
if (extn != null && extn.Length != 0)
{
for (int i = 0; i < extn.Length; i++)
{
var actualExtension = extn[i];
if (inbound)
{
frames = frames.SelectMany(x => actualExtension.ApplyIncoming(context, wsc, x));
}
else
{
frames = frames.SelectMany(x => actualExtension.ApplyOutgoing(context, wsc, x));
}
}
}
return(frames);
}
public override void Send(NetContext context, Connection connection, object message)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
string s;
WebSocketConnection wsConnection;
WebSocketsFrame frame;
var encoding = Encoding.UTF8;
if ((s = message as string) != null && (wsConnection = connection as WebSocketConnection) != null &&
wsConnection.MaxCharactersPerFrame > 0 && s.Length > wsConnection.MaxCharactersPerFrame)
{
int remaining = s.Length, charIndex = 0;
bool isFirst = true;
char[] charBuffer = s.ToCharArray();
var batch = new List <IFrame>();
while (remaining > 0)
{
int charCount = Math.Min(remaining, wsConnection.MaxCharactersPerFrame);
var buffer = encoding.GetBytes(charBuffer, charIndex, charCount);
//Debug.WriteLine("> " + new string(charBuffer, charIndex, charCount));
remaining -= charCount;
charIndex += charCount;
frame = new WebSocketsFrame();
frame.OpCode = isFirst ? WebSocketsFrame.OpCodes.Text : WebSocketsFrame.OpCodes.Continuation;
isFirst = false;
frame.Payload = new BufferStream(context, context.Handler.MaxOutgoingQuota);
frame.Payload.Write(buffer, 0, buffer.Length);
frame.PayloadLength = buffer.Length;
frame.Mask = IsClient ? (int?)CreateMask() : null;
frame.Payload.Position = 0;
frame.IsFinal = remaining <= 0;
foreach (var final in ApplyExtensions(context, connection, frame, false))
{
batch.Add(final);
}
}
SendData(context, batch);
return;
}
byte[] blob;
frame = new WebSocketsFrame();
frame.Payload = new BufferStream(context, context.Handler.MaxOutgoingQuota);
if (s != null)
{
frame.OpCode = WebSocketsFrame.OpCodes.Text;
var buffer = encoding.GetBytes(s);
//Debug.WriteLine("> " + s);
frame.Payload.Write(buffer, 0, buffer.Length);
frame.PayloadLength = buffer.Length;
}
else if ((blob = message as byte[]) != null)
{
frame.OpCode = WebSocketsFrame.OpCodes.Binary;
frame.Payload.Write(blob, 0, blob.Length);
frame.PayloadLength = blob.Length;
}
else
{
throw new NotSupportedException(message.ToString());
}
frame.Mask = IsClient ? (int?)CreateMask() : null;
frame.Payload.Position = 0;
frame.IsFinal = true;
foreach (var final in ApplyExtensions(context, connection, frame, false))
{
SendData(context, final);
}
}
private void ProcessFrame(NetContext context, Connection connection, WebSocketsFrame frame)
{
if (IsClient)
{
if (frame.Mask.HasValue)
{
throw new InvalidOperationException("Clients only expect unmasked frames");
}
}
else
{
if (!frame.Mask.HasValue)
{
throw new InvalidOperationException("Servers only expect masked frames");
}
}
var ws = (WebSocketConnection)connection;
if (frame.IsControlFrame)
{
if (!frame.IsFinal)
{
throw new InvalidOperationException("control frames cannot be fragmented");
}
switch (frame.OpCode)
{
case WebSocketsFrame.OpCodes.Close:
// respond with a closing handshake
GracefulShutdown(context, connection);
break;
case WebSocketsFrame.OpCodes.Pong:
// could add some reaction here
break;
case WebSocketsFrame.OpCodes.Ping:
// send a "pong" with the same payload
var pong = new WebSocketsFrame();
if (IsClient)
{
pong.Mask = CreateMask();
}
pong.OpCode = WebSocketsFrame.OpCodes.Binary;
pong.PayloadLength = frame.PayloadLength;
if (frame.Payload != null)
{
var ms = new MemoryStream((int)frame.Payload.Length);
byte[] buffer = null;
try
{
buffer = context.GetBuffer();
Copy(frame.Payload, ms, buffer, null, frame.PayloadLength);
} finally
{
context.Recycle(buffer);
}
pong.Payload = ms;
}
SendControl(context, pong);
connection.PromptToSend(context);
break;
default:
throw new InvalidOperationException();
}
}
else
{
if (!ws.AllowIncomingDataFrames)
{
throw new InvalidOperationException("Data frames disabled");
}
int pendingCount = FrameCount;
if (frame.OpCode == WebSocketsFrame.OpCodes.Continuation)
{
if (pendingCount == 0)
{
throw new InvalidOperationException("Continuation of nothing");
}
}
else if (pendingCount != 0)
{
throw new InvalidOperationException("Should be a continuation");
}
if (!frame.IsFinal)
{
Push(context, frame);
}
else
{
if (pendingCount == 0)
{
Process(context, connection, frame.Payload, frame.OpCode);
}
else
{
throw new NotImplementedException();
}
}
}
if (frame.OpCode == WebSocketsFrame.OpCodes.Close)
{
Debug.WriteLine("Sent close frame: " + connection);
}
}
protected override int ProcessIncoming(NetContext context, Connection connection, Stream incoming)
{
if (incoming.Length < 2)
{
return(0); // can't read that; frame takes at minimum two bytes
}
byte[] buffer = null;
try
{
buffer = context.GetBuffer();
int read;
// read as much as possible up to 14 bytes; that gives us space for 2 bytes frame header, 8 bytes length, and 4 bytes mask
read = NetContext.TryFill(incoming, buffer, 14);
int headerLength;
var frame = WebSocketsFrame.TryParseFrameHeader(buffer, read, out headerLength);
if (frame == null)
{
return(0);
}
int payloadLen = frame.PayloadLength;
#if VERBOSE
Debug.WriteLine("Parsed header from: " + BitConverter.ToString(buffer, 0, headerLength));
#endif
if (incoming.Length < headerLength + payloadLen)
{
return(0); // not enough data to read the payload
}
if (payloadLen != 0)
{
Stream payload = null;
try
{
payload = new BufferStream(context, context.Handler.MaxIncomingQuota);
if (read != headerLength)
{
incoming.Position -= (read - headerLength); // we got it wrong...
}
Copy(incoming, payload, buffer, frame.Mask, payloadLen);
if (payloadLen != payload.Length)
{
throw new InvalidOperationException("I munged the data");
}
frame.Payload = payload;
payload = null;
}
finally
{
if (payload != null)
{
payload.Dispose();
}
}
}
foreach (var final in ApplyExtensions(context, connection, frame, true))
{
ProcessFrame(context, connection, final);
}
return(headerLength + payloadLen);
}
finally
{
context.Recycle(buffer);
}
}
IEnumerable <WebSocketsFrame> IExtension.ApplyIncoming(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (frame.Reserved1 && !frame.IsControlFrame)
{
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
outBuffer = context.GetBuffer();
inBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
if (inbound == null)
{
inbound = new ZStream();
inbound.inflateInit();
// fake a zlib header with:
// CMF:
// CM = 8 (deflate)
// CINFO = 7 (32k window)
// FLG:
// FCHECK: 26 (checksum of other bits)
// FDICT: 0 (no dictionary)
// FLEVEL: 3 (maximum)
inBuffer[0] = 120;
inBuffer[1] = 218;
inbound.next_in = inBuffer;
int chk = Inflate(tmp, outBuffer, 2);
if (chk != 0)
{
throw new InvalidOperationException("Spoofed zlib header suggested data");
}
}
inbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
//bool first = true;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0)
{
break;
}
remaining -= readCount;
//if (first)
//{ // kill the BFINAL flag from the first block, if set; we don't want zlib
// // trying to verify the ADLER checksum; unfortunately, a frame can contain
// // multiple blocks, and a *later* block could have BFINAL set. That sucks.
// inBuffer[0] &= 254;
// first = false;
//}
Inflate(tmp, outBuffer, readCount);
}
if (remaining != 0)
{
throw new EndOfStreamException();
}
// spoof the missing 4 bytes from the tail
inBuffer[0] = inBuffer[1] = 0x00;
inBuffer[2] = inBuffer[3] = 0xFF;
Inflate(tmp, outBuffer, 4);
// set our final output
tmp.Position = 0;
frame.Payload = tmp;
long bytesSaved = tmp.Length - frame.PayloadLength;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = false;
tmp = payload as BufferStream;
parent.RegisterInboundBytesSaved(bytesSaved);
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (inbound != null)
{
inbound.next_out = null;
inbound.next_in = null;
}
if (tmp != null)
{
tmp.Dispose();
}
if (inBuffer != null)
{
context.Recycle(inBuffer);
}
if (outBuffer != null)
{
context.Recycle(outBuffer);
}
if (parent.disableContextTakeover)
{
ClearContext(true, false);
}
}
}
yield return(frame);
}
private void Process(NetContext context, Connection connection, Stream stream, WebSocketsFrame.OpCodes opCode)
{
using (stream)
{
switch (opCode)
{
case WebSocketsFrame.OpCodes.Text:
string s;
if (stream == null || stream.Length == 0) s = "";
else
{
stream.Position = 0;
using (var reader = new StreamReader(stream, Encoding.UTF8))
{
s = reader.ReadToEnd();
}
}
context.Handler.OnReceived(connection, s);
break;
case WebSocketsFrame.OpCodes.Binary:
byte[] blob;
int len;
if (stream == null || (len = ((int)stream.Length - (int)stream.Position)) == 0) blob = new byte[0];
else
{
blob = new byte[len];
byte[] buffer = null;
try
{
buffer = context.GetBuffer();
int offset = 0, read;
stream.Position = 0;
while((read = stream.Read(buffer, offset, Math.Min(len, buffer.Length))) > 0)
{
offset += read;
len -= read;
}
if(len != 0) throw new EndOfStreamException();
} finally
{
context.Recycle(buffer);
}
}
context.Handler.OnReceived(connection, blob);
break;
default:
throw new InvalidOperationException();
}
}
}
public override void Send(NetContext context, Connection connection, object message)
{
if(message == null) throw new ArgumentNullException("message");
string s;
WebSocketConnection wsConnection;
WebSocketsFrame frame;
var encoding = Encoding.UTF8;
if ((s = message as string) != null && (wsConnection = connection as WebSocketConnection) != null
&& wsConnection.MaxCharactersPerFrame > 0 && s.Length > wsConnection.MaxCharactersPerFrame)
{
int remaining = s.Length, charIndex = 0;
bool isFirst = true;
char[] charBuffer = s.ToCharArray();
var batch = new List<IFrame>();
while(remaining > 0)
{
int charCount = Math.Min(remaining, wsConnection.MaxCharactersPerFrame);
var buffer = encoding.GetBytes(charBuffer, charIndex, charCount);
//Debug.WriteLine("> " + new string(charBuffer, charIndex, charCount));
remaining -= charCount;
charIndex += charCount;
frame = new WebSocketsFrame();
frame.OpCode = isFirst ? WebSocketsFrame.OpCodes.Text : WebSocketsFrame.OpCodes.Continuation;
isFirst = false;
frame.Payload = new BufferStream(context, context.Handler.MaxOutgoingQuota);
frame.Payload.Write(buffer, 0, buffer.Length);
frame.PayloadLength = buffer.Length;
frame.Mask = IsClient ? (int?)CreateMask() : null;
frame.Payload.Position = 0;
frame.IsFinal = remaining <= 0;
foreach (var final in ApplyExtensions(context, connection, frame, false))
{
batch.Add(final);
}
}
SendData(context, batch);
return;
}
byte[] blob;
frame = new WebSocketsFrame();
frame.Payload = new BufferStream(context, context.Handler.MaxOutgoingQuota);
if(s != null)
{
frame.OpCode = WebSocketsFrame.OpCodes.Text;
var buffer = encoding.GetBytes(s);
//Debug.WriteLine("> " + s);
frame.Payload.Write(buffer, 0, buffer.Length);
frame.PayloadLength = buffer.Length;
}
else if ((blob = message as byte[]) != null)
{
frame.OpCode = WebSocketsFrame.OpCodes.Binary;
frame.Payload.Write(blob, 0, blob.Length);
frame.PayloadLength = blob.Length;
}
else
{
throw new NotSupportedException(message.ToString());
}
frame.Mask = IsClient ? (int?)CreateMask() : null;
frame.Payload.Position = 0;
frame.IsFinal = true;
foreach(var final in ApplyExtensions(context, connection, frame, false))
{
SendData(context, final);
}
}
protected void Push(NetContext context, WebSocketsFrame frame)
{
lock (this)
{
int maxQuota = context.Handler.MaxIncomingQuota;
if (maxQuota > 0 && ProtocolProcessor.Sum(holder, f =>
{
var typed = f as WebSocketsFrame;
return typed == null ? 0 : typed.GetLengthEstimate();
}) + frame.GetLengthEstimate() > maxQuota)
{
throw new InvalidOperationException("Inbound quota exceeded");
}
ProtocolProcessor.AddFrame(context, ref holder, frame);
}
}
public static WebSocketsFrame TryParseFrameHeader(byte[] buffer, int bytesAvailable, out int headerLength)
{
int maskOffset;
if (bytesAvailable < 2)
{
headerLength = 0;
return(null);
}
bool masked = (buffer[1] & 128) != 0;
int tmp = buffer[1] & 127;
int payloadLen;
switch (tmp)
{
case 126:
headerLength = masked ? 8 : 4;
if (bytesAvailable < headerLength)
{
return(null);
}
payloadLen = (buffer[2] << 8) | buffer[3];
maskOffset = 4;
break;
case 127:
headerLength = masked ? 14 : 10;
if (bytesAvailable < headerLength)
{
return(null);
}
int big = WebSocketsProcessor.ReadInt32(buffer, 2), little = WebSocketsProcessor.ReadInt32(buffer, 6);
if (big != 0 || little < 0)
{
throw new ArgumentOutOfRangeException(); // seriously, we're not going > 2GB
}
payloadLen = little;
maskOffset = 10;
break;
default:
headerLength = masked ? 6 : 2;
if (bytesAvailable < headerLength)
{
return(null);
}
payloadLen = tmp;
maskOffset = 2;
break;
}
var frame = new WebSocketsFrame();
frame.IsFinal = (buffer[0] & 128) != 0;
frame.Reserved1 = (buffer[0] & 64) != 0;
frame.Reserved2 = (buffer[0] & 32) != 0;
frame.Reserved3 = (buffer[0] & 16) != 0;
frame.OpCode = (WebSocketsFrame.OpCodes)(buffer[0] & 15);
frame.Mask = masked ? (int?)WebSocketsProcessor.ReadInt32(buffer, maskOffset) : null;
frame.PayloadLength = payloadLen;
return(frame);
}
public void CompressFrame()
{
var handler = new TcpHandler();
var ctx = new NetContext(delegate { }, handler);
IExtensionFactory factory = new PerFrameDeflate(0, false);
var extn = factory.CreateExtension("deflate-frame");
var data = Encoding.UTF8.GetBytes("Hello");
var frame = new WebSocketsFrame
{
OpCode = WebSocketsFrame.OpCodes.Text,
Payload = new MemoryStream(data),
PayloadLength = data.Length,
Reserved1 = false
};
var connection = new WebSocketConnection(new IPEndPoint(IPAddress.Loopback, 20000));
var encoded = extn.ApplyOutgoing(ctx, connection, frame).Single();
var ms = new MemoryStream();
encoded.Payload.CopyTo(ms);
string hex = BitConverter.ToString(ms.GetBuffer(), 0, (int)ms.Length);
Assert.AreEqual("F2-48-CD-C9-C9-07-00", hex);
// unrelated decoder
extn = PerFrameDeflate.Default.CreateExtension("deflate-frame");
var decoded = extn.ApplyIncoming(ctx, connection, frame).Single();
ms = new MemoryStream();
decoded.Payload.Position = 0;
decoded.Payload.CopyTo(ms);
string s = Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Length);
Assert.AreEqual("Hello", s);
}
IEnumerable<WebSocketsFrame> IExtension.ApplyIncoming(NetContext context, WebSocketConnection connection, WebSocketsFrame frame)
{
if (frame.Reserved1 && !frame.IsControlFrame)
{
BufferStream tmp = null;
var payload = frame.Payload;
payload.Position = 0;
byte[] inBuffer = null, outBuffer = null;
try
{
outBuffer = context.GetBuffer();
inBuffer = context.GetBuffer();
tmp = new BufferStream(context, 0);
if (inbound == null)
{
inbound = new ZStream();
inbound.inflateInit();
// fake a zlib header with:
// CMF:
// CM = 8 (deflate)
// CINFO = 7 (32k window)
// FLG:
// FCHECK: 26 (checksum of other bits)
// FDICT: 0 (no dictionary)
// FLEVEL: 3 (maximum)
inBuffer[0] = 120;
inBuffer[1] = 218;
inbound.next_in = inBuffer;
int chk = Inflate(tmp, outBuffer, 2);
if (chk != 0) throw new InvalidOperationException("Spoofed zlib header suggested data");
}
inbound.next_in = inBuffer;
int remaining = frame.PayloadLength;
//bool first = true;
while (remaining > 0)
{
int readCount = payload.Read(inBuffer, 0, inBuffer.Length);
if (readCount <= 0) break;
remaining -= readCount;
//if (first)
//{ // kill the BFINAL flag from the first block, if set; we don't want zlib
// // trying to verify the ADLER checksum; unfortunately, a frame can contain
// // multiple blocks, and a *later* block could have BFINAL set. That sucks.
// inBuffer[0] &= 254;
// first = false;
//}
Inflate(tmp, outBuffer, readCount);
}
if (remaining != 0) throw new EndOfStreamException();
// spoof the missing 4 bytes from the tail
inBuffer[0] = inBuffer[1] = 0x00;
inBuffer[2] = inBuffer[3] = 0xFF;
Inflate(tmp, outBuffer, 4);
// set our final output
tmp.Position = 0;
frame.Payload = tmp;
long bytesSaved = tmp.Length - frame.PayloadLength;
frame.PayloadLength = (int)tmp.Length;
frame.Reserved1 = false;
tmp = payload as BufferStream;
parent.RegisterInboundBytesSaved(bytesSaved);
}
#if DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex);
throw;
}
#endif
finally
{
if (inbound != null)
{
inbound.next_out = null;
inbound.next_in = null;
}
if (tmp != null) tmp.Dispose();
if (inBuffer != null) context.Recycle(inBuffer);
if (outBuffer != null) context.Recycle(outBuffer);
if (parent.disableContextTakeover) ClearContext(true, false);
}
}
yield return frame;
}
static WebSocketsFrame CreateFrame(string text)
{
var bytes = Encoding.UTF8.GetBytes(text);
var frame = new WebSocketsFrame { OpCode = WebSocketsFrame.OpCodes.Text, Payload = new MemoryStream(bytes), PayloadLength = bytes.Length };
return frame;
}
