Beispiel #1
0
Request::State
RequestParser::parseWebSocketMessage(Request& req, ReplyPtr reply,
				     Buffer::iterator& begin,
				     Buffer::iterator end)
{
  switch (wsState_) {
  case ws_start:
    {
      if (req.webSocketVersion != 0
	  && req.webSocketVersion != 7
	  && req.webSocketVersion != 8
	  && req.webSocketVersion != 13) {
	LOG_ERROR("ws: unsupported protocol version " << req.webSocketVersion);
	// FIXME add Sec-WebSocket-Version fields
	return Request::Error;
      }

      if (req.webSocketVersion == 0) {
	LOG_INFO("ws: connect with protocol version 0");
	/*
	 * In version 00, the hand shake is two-staged, we first need to
	 * send the 101 to be able to access the part of the handshake
	 * that is sent after the GET
	 */
	const Request::Header *host = req.getHeader("Host");
	if (!host || host->value.empty()) {
	  LOG_ERROR("ws: missing Host field");
	  return Request::Error;
	}

	wsState_ = ws00_hand_shake;
	wsCount_ = 0;

	reply->setStatus(Reply::switching_protocols);
	reply->addHeader("Connection", "Upgrade");
	reply->addHeader("Upgrade", "WebSocket");

	const Request::Header *origin = req.getHeader("Origin");
	if (origin && !origin->value.empty())
	  reply->addHeader("Sec-WebSocket-Origin", origin->value.str());

	std::string location = std::string(req.urlScheme)
	  + "://" + host->value.str() + req.request_path
	  + "?" + req.request_query;
	reply->addHeader("Sec-WebSocket-Location", location);

	reply->consumeData(begin, begin, Request::Partial);

	return Request::Complete;
      } else {
	LOG_INFO("ws: connect with protocol version " << req.webSocketVersion);
	std::string accept = doWebSocketHandshake13(req);

	if (accept.empty()) {
	  LOG_ERROR("ws: error computing handshake result");
	  return Request::Error;
	} else {
	  wsState_ = ws13_frame_start;
	  reply->setStatus(Reply::switching_protocols);
	  reply->addHeader("Connection", "Upgrade");
	  reply->addHeader("Upgrade", "WebSocket");
	  reply->addHeader("Sec-WebSocket-Accept", accept);
	  reply->consumeData(begin, begin, Request::Complete);

	  return Request::Complete;
	}
      }

      break;
    }
  case ws00_hand_shake:
    {
      unsigned thisSize = std::min((::int64_t)(end - begin),
				   (::int64_t)(8 - wsCount_));

      memcpy(ws00_buf_ + wsCount_, begin, thisSize);
      wsCount_ += thisSize;
      begin += thisSize;

      if (wsCount_ == 8) {
	bool okay = doWebSocketHandshake00(req);

	if (okay) {
	  wsState_ = ws00_frame_start;
	  reply->consumeData(ws00_buf_, ws00_buf_ + 16, Request::Complete);

	  return Request::Complete;
	} else {
	  LOG_ERROR("ws: invalid client hand-shake");
	  return Request::Error;
	}
      } else
	return Request::Partial;
    }
  default:
    break;
  }

  Buffer::iterator dataBegin = begin;
  Buffer::iterator dataEnd = begin; // Initially assume no data

  Request::State state = Request::Partial;

  while (begin < end && state == Request::Partial) {
    switch (wsState_) {
    case ws00_frame_start:
      wsFrameType_ = *begin;

      if (wsFrameType_ & 0x80) {
	wsState_ = ws00_binary_length;
	remainder_ = 0;
      } else {
	wsState_ = ws00_text_data;
	dataBegin = begin + 1;
	remainder_ = 0;
      }

      ++begin;

      break;
    case ws00_binary_length:
      remainder_ = remainder_ << 7 | (*begin & 0x7F);
      if ((*begin & 0x80) == 0) {
	if (remainder_ == 0 || remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized binary frame of length " << remainder_);
	  return Request::Error;
	}
	wsState_ = ws00_binary_data;
      }

      ++begin;

      break;
    case ws00_text_data:
      if (static_cast<unsigned char>(*begin) == 0xFF) {
	state = Request::Complete;
	wsState_ = ws00_frame_start;
	dataEnd = begin;
      } else {
	++remainder_;

	if (remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized text frame of length " << remainder_);
	  return Request::Error;
	}
      }

      ++begin;

      break;
    case ws00_binary_data:
      {
	::int64_t thisSize = std::min((::int64_t)(end - begin), remainder_);

	dataBegin = begin;
	begin = begin + thisSize;
	dataEnd = begin;
	remainder_ -= thisSize;

	if (remainder_ == 0) {
	  state = Request::Complete;
	  wsState_ = ws00_frame_start;
	}

	break;
      }
    case ws13_frame_start:
      {
	unsigned char frameType = *begin;

	LOG_DEBUG("ws: new frame, opcode byte=" << (int)frameType);

	/* RSV1-3 must be 0 */
	if (frameType & 0x70)
	  return Request::Error;

	switch (frameType & 0x0F) {
	case 0x0: // Continuation frame of a fragmented message
	  if (frameType & 0x80)
	    wsFrameType_ |= 0x80; // mark the end-of-frame

	  break;
	case 0x1: // Text frame
	case 0x2: // Binary frame
	case 0x8: // Close
	case 0x9: // Ping
	case 0xA: // Pong
	  wsFrameType_ = frameType;

	  break;
	default:
	  LOG_ERROR("ws: unknown opcode");
	  return Request::Error;
	}

	wsState_ = ws13_payload_length;
	wsCount_ = 0;

	++begin;

	break;
      }
    case ws13_payload_length:
      /* Client frame must be masked */
      if ((*begin & 0x80) == 0) {
	LOG_ERROR("ws: client frame not masked");
	return Request::Error;
      }

      remainder_ = *begin & 0x7F;

      if (remainder_ < 126) {
	LOG_DEBUG("ws: new frame length " << remainder_);
	wsMask_ = 0;
	wsState_ = ws13_mask;
	wsCount_ = 4;
      } else if (remainder_ == 126) {
	wsState_ = ws13_extended_payload_length;
	wsCount_ = 2;
	remainder_ = 0;
      } else if (remainder_ == 127) {
	wsState_ = ws13_extended_payload_length;
	wsCount_ = 8;
	remainder_ = 0;
      }

      ++begin;

      break;
    case ws13_extended_payload_length:
      remainder_ <<= 8;
      remainder_ |= (unsigned char)(*begin);
      --wsCount_;

      if (wsCount_ == 0) {
	LOG_DEBUG("ws: new frame length " << remainder_);
	if (remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized frame of length " << remainder_);
	  return Request::Error;
	}
	wsMask_ = 0;
	wsState_ = ws13_mask;
	wsCount_ = 4;
      }

      ++begin;

      break;
    case ws13_mask:
      wsMask_ <<= 8;
      wsMask_ |= (unsigned char)(*begin);
      --wsCount_;

      if (wsCount_ == 0) {
	LOG_DEBUG("ws: new frame read mask");
	if (remainder_ != 0) {
	  wsState_ = ws13_payload;
	} else {
	  // Frame without data (like pong)
	  if (wsFrameType_ & 0x80)
	    state = Request::Complete;
	  wsState_ = ws13_frame_start;
	}
      }
      
      ++begin;

      break;
    case ws13_payload:
      {
	::int64_t thisSize = std::min((::int64_t)(end - begin), remainder_);

	dataBegin = begin;
	begin = begin + thisSize;
	dataEnd = begin;
	remainder_ -= thisSize;

	/* Unmask dataBegin to dataEnd, mask offset in wsCount_ */
	for (Buffer::iterator i = dataBegin; i != dataEnd; ++i) {
	  unsigned char d = *i;
	  unsigned char m = (unsigned char)(wsMask_ >> ((3 - wsCount_) * 8));
	  d = d ^ m;
	  *i = d;
	  wsCount_ = (wsCount_ + 1) % 4;
	}

	LOG_DEBUG("ws: reading payload, remains = " << remainder_);

	if (remainder_ == 0) {
	  if (wsFrameType_ & 0x80)
	    state = Request::Complete;

	  wsState_ = ws13_frame_start;
	}

	break;
      }
    default:
      assert(false);
    }
  }

  LOG_DEBUG("ws: " << (dataEnd - dataBegin) << "," << state);

  if (dataBegin < dataEnd || state == Request::Complete) {
    if (wsState_ < ws13_frame_start) {
      if (wsFrameType_ == 0x00)
	reply->consumeWebSocketMessage(Reply::text_frame,
				       dataBegin, dataEnd, state);
    } else {
      Reply::ws_opcode opcode = (Reply::ws_opcode)(wsFrameType_ & 0x0F);
      reply->consumeWebSocketMessage(opcode, dataBegin, dataEnd, state);
    }
  }

  return state;
}
Beispiel #2
0
Request::State
RequestParser::parseWebSocketMessage(Request& req, ReplyPtr reply,
				     char *& begin,
				     char * end)
{
  switch (wsState_) {
  case ws_start:
    {
      if (req.webSocketVersion != 0
	  && req.webSocketVersion != 7
	  && req.webSocketVersion != 8
	  && req.webSocketVersion != 13) {
	LOG_ERROR("ws: unsupported protocol version " << req.webSocketVersion);
	// FIXME add Sec-WebSocket-Version fields
	return Request::Error;
      }

      if (req.webSocketVersion == 0) {
	LOG_INFO("ws: connect with protocol version 0");
	/*
	 * In version 00, the hand shake is two-staged, we first need to
	 * send the 101 to be able to access the part of the handshake
	 * that is sent after the GET
	 */
	const Request::Header *host = req.getHeader("Host");
	if (!host || host->value.empty()) {
	  LOG_ERROR("ws: missing Host field");
	  return Request::Error;
	}

	wsState_ = ws00_hand_shake;
	wsCount_ = 0;

	reply->setStatus(Reply::switching_protocols);
	reply->addHeader("Connection", "Upgrade");
	reply->addHeader("Upgrade", "WebSocket");

	const Request::Header *origin = req.getHeader("Origin");
	if (origin && !origin->value.empty())
	  reply->addHeader("Sec-WebSocket-Origin", origin->value.str());

	std::string location = std::string(req.urlScheme)
	  + "://" + host->value.str() + req.request_path
	  + "?" + req.request_query;
	reply->addHeader("Sec-WebSocket-Location", location);

	reply->consumeData(&*begin, &*begin, Request::Partial);

	return Request::Complete;
      } else {
	LOG_INFO("ws: connect with protocol version " << req.webSocketVersion);
	std::string accept = doWebSocketHandshake13(req);

	if (accept.empty()) {
	  LOG_ERROR("ws: error computing handshake result");
	  return Request::Error;
	} else {
	  wsState_ = ws13_frame_start;
	  reply->setStatus(Reply::switching_protocols);
	  reply->addHeader("Connection", "Upgrade");
	  reply->addHeader("Upgrade", "WebSocket");
	  reply->addHeader("Sec-WebSocket-Accept", accept);
#ifdef WTHTTP_WITH_ZLIB
	  std::string compressHeader;
	  if(!doWebSocketPerMessageDeflateNegotiation(req, compressHeader))
		return Request::Error;
	  
	  if(!compressHeader.empty())  {
		// We can use per message deflate
		if(initInflate()) {
		  LOG_DEBUG("Extension per_message_deflate requested");
		  reply->addHeader("Sec-WebSocket-Extensions", compressHeader);
		}else {
		  // Decompress not available disable
		  req.pmdState_.enabled = false;
		}
	  }
#endif

	  reply->consumeData(&*begin, &*begin, Request::Complete);

	  return Request::Complete;
	}
      }

      break;
    }
  case ws00_hand_shake:
    {
      unsigned thisSize = std::min((::int64_t)(end - begin),
				   (::int64_t)(8 - wsCount_));

      memcpy(ws00_buf_ + wsCount_, &*begin, thisSize);
      wsCount_ += thisSize;
      begin += thisSize;

      if (wsCount_ == 8) {
	bool okay = doWebSocketHandshake00(req);

	if (okay) {
	  wsState_ = ws00_frame_start;
	  reply->consumeData(ws00_buf_, ws00_buf_ + 16, Request::Complete);

	  return Request::Complete;
	} else {
	  LOG_ERROR("ws: invalid client hand-shake");
	  return Request::Error;
	}
      } else
	return Request::Partial;
    }
  default:
    break;
  }

  char *dataBegin = begin;
  char *dataEnd = begin; // Initially assume no data

  Request::State state = Request::Partial;

  while (begin < end && state == Request::Partial) {
    switch (wsState_) {
    case ws00_frame_start:
      wsFrameType_ = *begin;

      if (wsFrameType_ & 0x80) {
	wsState_ = ws00_binary_length;
	remainder_ = 0;
      } else {
	wsState_ = ws00_text_data;
	dataBegin = begin + 1;
	remainder_ = 0;
      }

      ++begin;

      break;
    case ws00_binary_length:
      if (remainder_ >= (((int64_t)0x01) << 56)) {
        LOG_ERROR("ws: oversized binary frame: overflows 64-bit signed integer");
        return Request::Error;
      }
      remainder_ = remainder_ << 7 | (*begin & 0x7F);
      if ((*begin & 0x80) == 0) {
	if (remainder_ == 0 || remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized binary frame of length " << remainder_);
	  return Request::Error;
	}
	wsState_ = ws00_binary_data;
      }

      ++begin;

      break;
    case ws00_text_data:
      if (static_cast<unsigned char>(*begin) == 0xFF) {
	state = Request::Complete;
	wsState_ = ws00_frame_start;
	dataEnd = begin;
      } else {
	++remainder_;

	if (remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized text frame of length " << remainder_);
	  return Request::Error;
	}
      }

      ++begin;

      break;
    case ws00_binary_data:
      {
	::int64_t thisSize = std::min((::int64_t)(end - begin), remainder_);

	dataBegin = begin;
	begin = begin + thisSize;
	dataEnd = begin;
	remainder_ -= thisSize;

	if (remainder_ == 0) {
	  state = Request::Complete;
	  wsState_ = ws00_frame_start;
	}

	break;
      }
    case ws13_frame_start:
      {
	unsigned char frameType = *begin;

	LOG_DEBUG("ws: new frame, opcode byte=" << (int)frameType);

#ifdef WTHTTP_WITH_ZLIB
	/* RSV1-3 must be 0 */
	if (frameType & 0x70 && (!req.pmdState_.enabled && frameType & 0x30)) 
	  return Request::Error;
	
	frameCompressed_ = frameType & 0x40;
#else
	if(frameType & 0x70)
	  return Request::Error;
#endif


	switch (frameType & 0x0F) {
	case 0x0: // Continuation frame of a fragmented message
	  if (frameType & 0x80)
	    wsFrameType_ |= 0x80; // mark the end-of-frame

	  break;
	case 0x1: // Text frame
	case 0x2: // Binary frame
	case 0x8: // Close
	case 0x9: // Ping
	case 0xA: // Pong
	  wsFrameType_ = frameType;

	  break;
	default:
	  LOG_ERROR("ws: unknown opcode");
	  return Request::Error;
	}

	wsState_ = ws13_payload_length;
	wsCount_ = 0;

	++begin;

	break;
      }
    case ws13_payload_length:
      /* Client frame must be masked */
      if ((*begin & 0x80) == 0) {
	LOG_ERROR("ws: client frame not masked");
	return Request::Error;
      }

      remainder_ = *begin & 0x7F;

      if (remainder_ < 126) {
	LOG_DEBUG("ws: new frame length " << remainder_);
	wsMask_ = 0;
	wsState_ = ws13_mask;
	wsCount_ = 4;
      } else if (remainder_ == 126) {
	wsState_ = ws13_extended_payload_length;
	wsCount_ = 2;
	remainder_ = 0;
      } else if (remainder_ == 127) {
	wsState_ = ws13_extended_payload_length;
	wsCount_ = 8;
	remainder_ = 0;
      }

      ++begin;

      break;
    case ws13_extended_payload_length:
      if (wsCount_ == 8 &&
          (unsigned char)(*begin) > 127) {
        LOG_ERROR("ws: malformed 8-byte frame length, MSB is not 0");
        return Request::Error;
      }
      remainder_ <<= 8;
      remainder_ |= (unsigned char)(*begin);
      --wsCount_;

      if (wsCount_ == 0) {
	LOG_DEBUG("ws: new frame length " << remainder_);
	if (remainder_ >= MAX_WEBSOCKET_MESSAGE_LENGTH) {
	  LOG_ERROR("ws: oversized frame of length " << remainder_);
	  return Request::Error;
	}
	wsMask_ = 0;
	wsState_ = ws13_mask;
	wsCount_ = 4;
      }

      ++begin;

      break;
    case ws13_mask:
      wsMask_ <<= 8;
      wsMask_ |= (unsigned char)(*begin);
      --wsCount_;

      if (wsCount_ == 0) {
	LOG_DEBUG("ws: new frame read mask");
	if (remainder_ != 0) {
	  wsState_ = ws13_payload;
	} else {
	  // Frame without data (like pong)
	  if (wsFrameType_ & 0x80)
	    state = Request::Complete;
	  wsState_ = ws13_frame_start;
	}
      }
      
      ++begin;

      break;
    case ws13_payload:
      {
	::int64_t thisSize = std::min((::int64_t)(end - begin), remainder_);

	dataBegin = begin;
	begin = begin + thisSize;
	dataEnd = begin;
	remainder_ -= thisSize;

	/* Unmask dataBegin to dataEnd, mask offset in wsCount_ */
	for (char *i = dataBegin; i != dataEnd; ++i) {
	  unsigned char d = *i;
	  unsigned char m = (unsigned char)(wsMask_ >> ((3 - wsCount_) * 8));
	  d = d ^ m;
	  *i = d;
	  wsCount_ = (wsCount_ + 1) % 4;
	}

	LOG_DEBUG("ws: reading payload, remains = " << remainder_);

	if (remainder_ == 0) {
	  if (wsFrameType_ & 0x80)
	    state = Request::Complete;

	  wsState_ = ws13_frame_start;
	}

	break;
      }
    default:
      assert(false);
    }
  }

  LOG_DEBUG("ws: " << (dataEnd - dataBegin) << "," << state);

  if (dataBegin < dataEnd || state == Request::Complete) {
	char* beg = &*dataBegin;
	char* end = &*dataEnd;
#ifdef WTHTTP_WITH_ZLIB
	if (frameCompressed_) {
	  Reply::ws_opcode opcode = (Reply::ws_opcode)(wsFrameType_ & 0x0F);
	  if (wsState_ < ws13_frame_start) {
		if (wsFrameType_ == 0x00)
		  opcode = Reply::text_frame;
	  }
	  unsigned char appendBlock[] = { 0x00, 0x00, 0xff, 0xff };
	  bool hasMore = false;
	  char buffer[16 * 1024];
	  do {
		read_ = 0;
		bool ret1 =  inflate(reinterpret_cast<unsigned char*>(&*beg), 
			end - beg, reinterpret_cast<unsigned char*>(buffer), hasMore);

		if(!ret1) return Request::Error;
		
		reply->consumeWebSocketMessage(opcode, &buffer[0], &buffer[read_], hasMore ? Request::Partial : state);

	  } while (hasMore);

	  if (state == Request::Complete) 
	    if(!inflate(appendBlock, 4, reinterpret_cast<unsigned char*>(buffer), hasMore))
	      return Request::Error;

	  return state;
	}
#endif

	// handle uncompressed frame
	if (wsState_ < ws13_frame_start) {
	  if (wsFrameType_ == 0x00)
		reply->consumeWebSocketMessage(Reply::text_frame,
			beg, end, state);
	} else {
	  Reply::ws_opcode opcode = (Reply::ws_opcode)(wsFrameType_ & 0x0F);
	  reply->consumeWebSocketMessage(opcode, beg, end, state);
	}
  }

  return state;
}