mirror of
https://github.com/pocoproject/poco.git
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690 lines
16 KiB
C++
690 lines
16 KiB
C++
//
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// WebSocketImpl.cpp
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//
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// Library: Net
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// Package: WebSocket
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// Module: WebSocketImpl
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//
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// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif // NOMINMAX
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#include "Poco/Net/WebSocketImpl.h"
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#include "Poco/Net/NetException.h"
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#include "Poco/Net/WebSocket.h"
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#include "Poco/Net/HTTPSession.h"
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#include "Poco/Net/SocketAddress.h"
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#include "Poco/Buffer.h"
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#include "Poco/BinaryWriter.h"
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#include "Poco/BinaryReader.h"
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#include "Poco/MemoryStream.h"
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#include "Poco/Format.h"
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#include <limits>
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#include <cstring>
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namespace Poco {
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namespace Net {
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WebSocketImpl::WebSocketImpl(StreamSocketImpl* pStreamSocketImpl, HTTPSession& session, bool mustMaskPayload):
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StreamSocketImpl(pStreamSocketImpl->sockfd()),
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_pStreamSocketImpl(pStreamSocketImpl),
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_maxPayloadSize(std::numeric_limits<int>::max()),
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_buffer(0),
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_bufferOffset(0),
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_mustMaskPayload(mustMaskPayload)
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{
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poco_check_ptr(pStreamSocketImpl);
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_pStreamSocketImpl->duplicate();
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session.drainBuffer(_buffer);
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// Enable TCP_NODELAY to prevent delays caused by Nagle's algorithm
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// for small WebSocket frames. Skip for Unix domain sockets.
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try
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{
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#if defined(POCO_HAS_UNIX_SOCKET)
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if (_pStreamSocketImpl->address().family() != SocketAddress::UNIX_LOCAL)
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#endif
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_pStreamSocketImpl->setNoDelay(true);
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}
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catch (NetException&)
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{
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// Ignore - socket errors (e.g., not connected or doesn't support TCP options)
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}
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catch (Poco::Exception&)
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{
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// Ignore - other configuration errors (IOException, InvalidArgumentException, etc.)
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}
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}
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WebSocketImpl::~WebSocketImpl()
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{
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try
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{
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_pStreamSocketImpl->release();
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reset();
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}
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catch (...)
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{
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poco_unexpected();
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}
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}
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int WebSocketImpl::sendBytes(const void* buffer, int length, int flags)
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{
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if (_sendState.remainingPayloadLength > 0)
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{
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if (length != _sendState.length)
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{
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throw InvalidArgumentException("Pending send buffer length mismatch");
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}
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int sent = _pStreamSocketImpl->sendBytes(_sendState.payload.begin() + _sendState.remainingPayloadOffset, _sendState.remainingPayloadLength);
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if (sent >= 0)
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{
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if (sent < _sendState.remainingPayloadLength)
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{
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_sendState.remainingPayloadOffset += sent;
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_sendState.remainingPayloadLength -= sent;
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return -1;
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}
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else
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{
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_sendState.length = 0;
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_sendState.remainingPayloadOffset = 0;
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_sendState.remainingPayloadLength = 0;
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return length;
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}
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}
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else return -1;
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}
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Poco::Buffer<char>& frame(_sendState.payload);
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frame.resize(length + MAX_HEADER_LENGTH, false);
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Poco::MemoryOutputStream ostr(frame.begin(), frame.size());
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Poco::BinaryWriter writer(ostr, Poco::BinaryWriter::NETWORK_BYTE_ORDER);
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if (flags == 0) flags = WebSocket::FRAME_BINARY;
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flags &= 0xff;
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writer << static_cast<Poco::UInt8>(flags);
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Poco::UInt8 lengthByte(0);
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if (_mustMaskPayload)
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{
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lengthByte |= FRAME_FLAG_MASK;
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}
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if (length < 126)
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{
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lengthByte |= static_cast<Poco::UInt8>(length);
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writer << lengthByte;
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}
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else if (length < 65536)
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{
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lengthByte |= 126;
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writer << lengthByte << static_cast<Poco::UInt16>(length);
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}
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else
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{
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lengthByte |= 127;
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writer << lengthByte << static_cast<Poco::UInt64>(length);
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}
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if (_mustMaskPayload)
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{
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const Poco::UInt32 mask = _rnd.next();
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const char* m = reinterpret_cast<const char*>(&mask);
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const char* b = reinterpret_cast<const char*>(buffer);
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writer.writeRaw(m, MASK_LENGTH);
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char* p = frame.begin() + ostr.charsWritten();
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for (int i = 0; i < length; i++)
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{
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p[i] = b[i] ^ m[i % MASK_LENGTH];
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}
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}
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else
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{
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std::memcpy(frame.begin() + ostr.charsWritten(), buffer, length);
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}
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int frameLength = length + static_cast<int>(ostr.charsWritten());
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int sent = _pStreamSocketImpl->sendBytes(frame.begin(), frameLength);
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if (sent >= 0)
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{
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if (sent < frameLength)
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{
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_sendState.length = length;
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_sendState.remainingPayloadOffset = sent;
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_sendState.remainingPayloadLength = frameLength - sent;
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return -1;
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}
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else
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{
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_sendState.length = 0;
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_sendState.remainingPayloadOffset = 0;
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_sendState.remainingPayloadLength = 0;
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return length;
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}
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}
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else
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{
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_sendState.length = length;
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_sendState.remainingPayloadOffset = 0;
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_sendState.remainingPayloadLength = frameLength;
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return -1;
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}
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}
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int WebSocketImpl::peekHeader(ReceiveState& receiveState)
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{
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char header[MAX_HEADER_LENGTH];
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receiveState.frameFlags = 0;
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receiveState.useMask = false;
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receiveState.headerLength = 0;
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receiveState.payloadLength = 0;
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receiveState.remainingPayloadLength = 0;
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int n = peekSomeBytes(header, MAX_HEADER_LENGTH);
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if (n == 0)
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return 0;
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else if (n < 2)
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return -1;
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Poco::UInt8 flags = static_cast<Poco::UInt8>(header[0]);
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receiveState.frameFlags = flags;
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Poco::UInt8 lengthByte = static_cast<Poco::UInt8>(header[1]);
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receiveState.useMask = ((lengthByte & FRAME_FLAG_MASK) != 0);
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int maskOffset = 0;
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lengthByte &= 0x7f;
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if (lengthByte == 127)
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{
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if (n < 10)
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{
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receiveState.frameFlags = 0;
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return -1;
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}
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Poco::MemoryInputStream istr(header + 2, 8);
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Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
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Poco::UInt64 l;
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reader >> l;
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if (l > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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receiveState.payloadLength = static_cast<int>(l);
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maskOffset = 10;
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}
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else if (lengthByte == 126)
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{
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if (n < 4)
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{
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receiveState.frameFlags = 0;
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return -1;
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}
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Poco::MemoryInputStream istr(header + 2, 2);
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Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
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Poco::UInt16 l;
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reader >> l;
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if (l > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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receiveState.payloadLength = static_cast<int>(l);
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maskOffset = 4;
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}
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else
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{
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if (lengthByte > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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receiveState.payloadLength = lengthByte;
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maskOffset = 2;
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}
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if (receiveState.useMask)
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{
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if (n < maskOffset + MASK_LENGTH)
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{
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receiveState.frameFlags = 0;
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return -1;
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}
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std::memcpy(receiveState.mask, header + maskOffset, MASK_LENGTH);
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receiveState.headerLength = maskOffset + MASK_LENGTH;
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}
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else
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{
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receiveState.headerLength = maskOffset;
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}
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receiveState.remainingPayloadLength = receiveState.payloadLength;
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return receiveState.payloadLength;
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}
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void WebSocketImpl::skipHeader(int headerLength)
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{
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poco_assert_dbg (headerLength <= MAX_HEADER_LENGTH);
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if (headerLength > 0)
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{
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char header[MAX_HEADER_LENGTH];
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[[maybe_unused]] int n = receiveNBytes(header, headerLength);
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poco_assert_dbg (n == headerLength);
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}
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}
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void WebSocketImpl::setMaxPayloadSize(int maxPayloadSize)
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{
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poco_assert (maxPayloadSize > 0);
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_maxPayloadSize = maxPayloadSize;
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}
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int WebSocketImpl::receivePayload(char *buffer, int payloadLength, char mask[MASK_LENGTH], bool useMask, int maskOffset)
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{
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int received = receiveNBytes(reinterpret_cast<char*>(buffer), payloadLength);
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if (received > 0 && useMask)
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{
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for (int i = 0; i < received; i++)
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{
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buffer[i] ^= mask[(i + maskOffset) % MASK_LENGTH];
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}
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}
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return received;
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}
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int WebSocketImpl::receiveBytes(void* buffer, int length, int)
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{
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if (getBlocking())
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{
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int payloadLength = -1;
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while (payloadLength < 0)
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{
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payloadLength = peekHeader(_receiveState);
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}
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if (payloadLength <= 0)
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{
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skipHeader(_receiveState.headerLength);
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return payloadLength;
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}
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else if (payloadLength > length)
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{
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throw WebSocketException(Poco::format("Insufficient buffer for payload size %d", payloadLength), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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}
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skipHeader(_receiveState.headerLength);
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if (receivePayload(reinterpret_cast<char*>(buffer), payloadLength, _receiveState.mask, _receiveState.useMask, 0) != payloadLength)
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throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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return payloadLength;
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}
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else
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{
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if (_receiveState.remainingPayloadLength == 0)
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{
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int payloadLength = peekHeader(_receiveState);
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if (payloadLength <= 0)
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{
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skipHeader(_receiveState.headerLength);
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return payloadLength;
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}
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else if (payloadLength > length)
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{
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throw WebSocketException(Poco::format("Insufficient buffer for payload size %d", payloadLength), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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}
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_receiveState.payload.resize(payloadLength, false);
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skipHeader(_receiveState.headerLength);
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}
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else if (_receiveState.payloadLength > length)
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{
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throw WebSocketException(Poco::format("Insufficient buffer for payload size %d", _receiveState.payloadLength), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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}
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int payloadOffset = _receiveState.payloadLength - _receiveState.remainingPayloadLength;
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int n = receivePayload(_receiveState.payload.begin() + payloadOffset, _receiveState.remainingPayloadLength, _receiveState.mask, _receiveState.useMask, _receiveState.maskOffset);
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if (n > 0)
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{
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_receiveState.remainingPayloadLength -= n;
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if (_receiveState.remainingPayloadLength == 0)
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{
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_receiveState.maskOffset = 0;
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std::memcpy(buffer, _receiveState.payload.begin(), _receiveState.payloadLength);
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return _receiveState.payloadLength;
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}
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else
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{
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_receiveState.maskOffset += n;
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return -1;
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}
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}
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else if (n == 0)
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{
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throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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}
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else
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{
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return -1;
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}
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}
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}
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int WebSocketImpl::receiveBytes(Poco::Buffer<char>& buffer, int, const Poco::Timespan&)
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{
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if (getBlocking())
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{
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int payloadLength = -1;
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while (payloadLength < 0)
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{
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payloadLength = peekHeader(_receiveState);
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}
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if (payloadLength <= 0)
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{
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skipHeader(_receiveState.headerLength);
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return payloadLength;
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}
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std::size_t oldSize = buffer.size();
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buffer.resize(oldSize + payloadLength);
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skipHeader(_receiveState.headerLength);
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if (receivePayload(buffer.begin() + oldSize, payloadLength, _receiveState.mask, _receiveState.useMask, 0) != payloadLength)
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throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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return payloadLength;
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}
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else
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{
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if (_receiveState.remainingPayloadLength == 0)
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{
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int payloadLength = peekHeader(_receiveState);
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if (payloadLength <= 0)
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{
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skipHeader(_receiveState.headerLength);
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return payloadLength;
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}
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_receiveState.payload.resize(payloadLength, false);
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skipHeader(_receiveState.headerLength);
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}
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int payloadOffset = _receiveState.payloadLength - _receiveState.remainingPayloadLength;
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int n = receivePayload(_receiveState.payload.begin() + payloadOffset, _receiveState.remainingPayloadLength, _receiveState.mask, _receiveState.useMask, _receiveState.maskOffset);
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if (n > 0)
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{
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_receiveState.remainingPayloadLength -= n;
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if (_receiveState.remainingPayloadLength == 0)
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{
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_receiveState.maskOffset = 0;
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std::size_t oldSize = buffer.size();
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buffer.resize(oldSize + _receiveState.payloadLength);
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std::memcpy(buffer.begin() + oldSize, _receiveState.payload.begin(), _receiveState.payloadLength);
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return _receiveState.payloadLength;
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}
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else
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{
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_receiveState.maskOffset += n;
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return -1;
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}
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}
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else if (n == 0)
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{
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throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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}
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else
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{
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return -1;
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}
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}
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}
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int WebSocketImpl::receiveNBytes(void* buffer, int length)
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{
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int received = receiveSomeBytes(reinterpret_cast<char*>(buffer), length);
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if (received > 0)
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{
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while (received < length)
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{
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int n = receiveSomeBytes(reinterpret_cast<char*>(buffer) + received, length - received);
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if (n > 0)
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received += n;
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else
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break;
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}
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}
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return received;
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}
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int WebSocketImpl::receiveSomeBytes(char* buffer, int length)
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{
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int n = static_cast<int>(_buffer.size()) - _bufferOffset;
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if (n > 0)
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{
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if (length < n) n = length;
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std::memcpy(buffer, _buffer.begin() + _bufferOffset, n);
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_bufferOffset += length;
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return n;
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}
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else
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{
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return _pStreamSocketImpl->receiveBytes(buffer, length);
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}
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}
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int WebSocketImpl::peekSomeBytes(char* buffer, int length)
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{
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int n = static_cast<int>(_buffer.size()) - _bufferOffset;
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if (n > 0)
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{
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if (length < n) n = length;
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std::memcpy(buffer, _buffer.begin() + _bufferOffset, n);
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if (length > n)
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{
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int rc = _pStreamSocketImpl->receiveBytes(buffer + n, length - n);
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if (rc > 0)
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{
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std::size_t currentSize = _buffer.size();
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_buffer.resize(currentSize + rc);
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std::memcpy(_buffer.begin() + currentSize, buffer + n, rc);
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n += rc;
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}
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}
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return n;
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}
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else
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{
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int rc = _pStreamSocketImpl->receiveBytes(buffer, length);
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if (rc > 0)
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{
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_buffer.resize(rc);
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std::memcpy(_buffer.begin(), buffer, rc);
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_bufferOffset = 0;
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}
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return rc;
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}
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}
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SocketImpl* WebSocketImpl::acceptConnection(SocketAddress& clientAddr)
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{
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throw Poco::InvalidAccessException("Cannot acceptConnection() on a WebSocketImpl");
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}
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void WebSocketImpl::connect(const SocketAddress& address)
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{
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throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
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}
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void WebSocketImpl::connect(const SocketAddress& address, const Poco::Timespan& timeout)
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{
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throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
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}
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void WebSocketImpl::connectNB(const SocketAddress& address)
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{
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throw Poco::InvalidAccessException("Cannot connectNB() a WebSocketImpl");
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}
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void WebSocketImpl::bind(const SocketAddress& address, bool reuseAddress)
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{
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throw Poco::InvalidAccessException("Cannot bind() a WebSocketImpl");
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}
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void WebSocketImpl::bind(const SocketAddress& address, bool reuseAddress, bool reusePort)
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{
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throw Poco::InvalidAccessException("Cannot bind() a WebSocketImpl");
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}
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void WebSocketImpl::bind6(const SocketAddress& address, bool reuseAddress, bool ipV6Only)
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{
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throw Poco::InvalidAccessException("Cannot bind6() a WebSocketImpl");
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}
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void WebSocketImpl::bind6(const SocketAddress& address, bool reuseAddress, bool reusePort, bool ipV6Only)
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{
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throw Poco::InvalidAccessException("Cannot bind6() a WebSocketImpl");
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|
}
|
|
|
|
|
|
void WebSocketImpl::listen(int backlog)
|
|
{
|
|
throw Poco::InvalidAccessException("Cannot listen() on a WebSocketImpl");
|
|
}
|
|
|
|
|
|
void WebSocketImpl::close()
|
|
{
|
|
_pStreamSocketImpl->close();
|
|
reset();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::shutdownReceive()
|
|
{
|
|
_pStreamSocketImpl->shutdownReceive();
|
|
}
|
|
|
|
|
|
int WebSocketImpl::shutdownSend()
|
|
{
|
|
return _pStreamSocketImpl->shutdownSend();
|
|
}
|
|
|
|
|
|
int WebSocketImpl::shutdown()
|
|
{
|
|
return _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();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::setSendBufferSize(int size)
|
|
{
|
|
_pStreamSocketImpl->setSendBufferSize(size);
|
|
}
|
|
|
|
|
|
int WebSocketImpl::getSendBufferSize()
|
|
{
|
|
return _pStreamSocketImpl->getSendBufferSize();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::setReceiveBufferSize(int size)
|
|
{
|
|
_pStreamSocketImpl->setReceiveBufferSize(size);
|
|
}
|
|
|
|
|
|
int WebSocketImpl::getReceiveBufferSize()
|
|
{
|
|
return _pStreamSocketImpl->getReceiveBufferSize();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::setSendTimeout(const Poco::Timespan& timeout)
|
|
{
|
|
_pStreamSocketImpl->setSendTimeout(timeout);
|
|
}
|
|
|
|
|
|
Poco::Timespan WebSocketImpl::getSendTimeout()
|
|
{
|
|
return _pStreamSocketImpl->getSendTimeout();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::setReceiveTimeout(const Poco::Timespan& timeout)
|
|
{
|
|
_pStreamSocketImpl->setReceiveTimeout(timeout);
|
|
}
|
|
|
|
|
|
Poco::Timespan WebSocketImpl::getReceiveTimeout()
|
|
{
|
|
return _pStreamSocketImpl->getReceiveTimeout();
|
|
}
|
|
|
|
|
|
void WebSocketImpl::setBlocking(bool flag)
|
|
{
|
|
_pStreamSocketImpl->setBlocking(flag);
|
|
}
|
|
|
|
|
|
bool WebSocketImpl::getBlocking() const
|
|
{
|
|
return _pStreamSocketImpl->getBlocking();
|
|
}
|
|
|
|
|
|
int WebSocketImpl::available()
|
|
{
|
|
int n = static_cast<int>(_buffer.size()) - _bufferOffset;
|
|
if (n > 0)
|
|
return n + _pStreamSocketImpl->available();
|
|
else
|
|
return _pStreamSocketImpl->available();
|
|
}
|
|
|
|
|
|
} } // namespace Poco::Net
|