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//
// WebSocketImpl.cpp
//
// $Id: //poco/1.4/Net/src/WebSocketImpl.cpp#5 $
//
// Library: Net
// Package: WebSocket
// Module: WebSocketImpl
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Net/WebSocketImpl.h"
#include "Poco/Net/NetException.h"
#include "Poco/Net/WebSocket.h"
#include "Poco/Buffer.h"
#include "Poco/BinaryWriter.h"
#include "Poco/BinaryReader.h"
#include "Poco/MemoryStream.h"
#include "Poco/Format.h"
#include <cstring>
namespace Poco {
namespace Net {
WebSocketImpl::WebSocketImpl(StreamSocketImpl* pStreamSocketImpl, bool mustMaskPayload):
StreamSocketImpl(pStreamSocketImpl->sockfd()),
_pStreamSocketImpl(pStreamSocketImpl),
_frameFlags(0),
_mustMaskPayload(mustMaskPayload)
{
poco_check_ptr(pStreamSocketImpl);
_pStreamSocketImpl->duplicate();
}
WebSocketImpl::~WebSocketImpl()
{
_pStreamSocketImpl->release();
reset();
}
int WebSocketImpl::sendBytes(const void* buffer, int length, int flags)
{
Poco::Buffer<char> frame(length + MAX_HEADER_LENGTH);
Poco::MemoryOutputStream ostr(frame.begin(), frame.size());
Poco::BinaryWriter writer(ostr, Poco::BinaryWriter::NETWORK_BYTE_ORDER);
writer << static_cast<Poco::UInt8>(flags);
Poco::UInt8 lengthByte(0);
if (_mustMaskPayload)
{
lengthByte |= FRAME_FLAG_MASK;
}
if (length < 126)
{
lengthByte |= static_cast<Poco::UInt8>(length);
writer << lengthByte;
}
else if (length < 65536)
{
lengthByte |= 126;
writer << lengthByte << static_cast<Poco::UInt16>(length);
}
else
{
lengthByte |= 127;
writer << lengthByte << static_cast<Poco::UInt64>(length);
}
if (_mustMaskPayload)
{
const Poco::UInt32 mask = _rnd.next();
const char* m = reinterpret_cast<const char*>(&mask);
const char* b = reinterpret_cast<const char*>(buffer);
writer.writeRaw(m, 4);
char* p = frame.begin() + ostr.charsWritten();
for (int i = 0; i < length; i++)
{
p[i] = b[i] ^ m[i % 4];
}
}
else
{
std::memcpy(frame.begin() + ostr.charsWritten(), buffer, length);
}
_pStreamSocketImpl->sendBytes(frame.begin(), length + static_cast<int>(ostr.charsWritten()));
return length;
}
int WebSocketImpl::receiveBytes(void* buffer, int length, int)
{
char header[MAX_HEADER_LENGTH];
int n = _pStreamSocketImpl->receiveBytes(header, 2);
if (n == 1)
{
n += _pStreamSocketImpl->receiveBytes(header + 1, 1);
}
if (n == 2)
{
Poco::UInt8 lengthByte = static_cast<Poco::UInt8>(header[1]) & 0x7f;
if (lengthByte + 2 < MAX_HEADER_LENGTH)
{
n = _pStreamSocketImpl->receiveBytes(header + 2, lengthByte);
}
else
{
n = _pStreamSocketImpl->receiveBytes(header + 2, MAX_HEADER_LENGTH - 2);
}
}
else throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
if (n > 0)
{
n += 2;
Poco::MemoryInputStream istr(header, n);
Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
Poco::UInt8 flags;
Poco::UInt8 lengthByte;
char mask[4];
reader >> flags >> lengthByte;
_frameFlags = flags;
int payloadLength = 0;
int payloadOffset = 2;
if ((lengthByte & 0x7f) == 127)
{
Poco::UInt64 l;
reader >> l;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %Lu", l), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
payloadOffset += 8;
}
else if ((lengthByte & 0x7f) == 126)
{
Poco::UInt16 l;
reader >> l;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %hu", l), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
payloadOffset += 2;
}
else
{
Poco::UInt8 l = lengthByte & 0x7f;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %u", unsigned(l)), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
}
if (lengthByte & FRAME_FLAG_MASK)
{
reader.readRaw(mask, 4);
payloadOffset += 4;
}
int received = 0;
if (payloadOffset < n)
{
std::memcpy(buffer, header + payloadOffset, n - payloadOffset);
received = n - payloadOffset;
}
while (received < payloadLength)
{
n = _pStreamSocketImpl->receiveBytes(reinterpret_cast<char*>(buffer) + received, payloadLength - received);
if (n > 0)
received += n;
else
throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
}
if (lengthByte & FRAME_FLAG_MASK)
{
char* p = reinterpret_cast<char*>(buffer);
for (int i = 0; i < received; i++)
{
p[i] ^= mask[i % 4];
}
}
return received;
}
return n;
}
SocketImpl* WebSocketImpl::acceptConnection(SocketAddress& clientAddr)
{
throw Poco::InvalidAccessException("Cannot acceptConnection() on a WebSocketImpl");
}
void WebSocketImpl::connect(const SocketAddress& address)
{
throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
}
void WebSocketImpl::connect(const SocketAddress& address, const Poco::Timespan& timeout)
{
throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
}
void WebSocketImpl::connectNB(const SocketAddress& address)
{
throw Poco::InvalidAccessException("Cannot connectNB() a WebSocketImpl");
}
void WebSocketImpl::bind(const SocketAddress& address, bool reuseAddress)
{
throw Poco::InvalidAccessException("Cannot bind() a WebSocketImpl");
}
void WebSocketImpl::bind6(const SocketAddress& address, bool reuseAddress, bool ipV6Only)
{
throw Poco::InvalidAccessException("Cannot bind6() a WebSocketImpl");
}
void WebSocketImpl::listen(int backlog)
{
throw Poco::InvalidAccessException("Cannot listen() on a WebSocketImpl");
}
void WebSocketImpl::close()
{
_pStreamSocketImpl->close();
reset();
}
void WebSocketImpl::shutdownReceive()
{
_pStreamSocketImpl->shutdownReceive();
}
void WebSocketImpl::shutdownSend()
{
_pStreamSocketImpl->shutdownSend();
}
void WebSocketImpl::shutdown()
{
_pStreamSocketImpl->shutdown();
}
int WebSocketImpl::sendTo(const void* buffer, int length, const SocketAddress& address, int flags)
{
throw Poco::InvalidAccessException("Cannot sendTo() on a WebSocketImpl");
}
int WebSocketImpl::receiveFrom(void* buffer, int length, SocketAddress& address, int flags)
{
throw Poco::InvalidAccessException("Cannot receiveFrom() on a WebSocketImpl");
}
void WebSocketImpl::sendUrgent(unsigned char data)
{
throw Poco::InvalidAccessException("Cannot sendUrgent() on a WebSocketImpl");
}
bool WebSocketImpl::secure() const
{
return _pStreamSocketImpl->secure();
}
} } // namespace Poco::Net
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